Original Papers | 原著論文

Updated Oct 06, 2026

2026

  1. [New!] Development of high-performance p-type nano-grained bulk Silicon-Germanium thermoelectric materials
    R. Ishihara, M. Matsunami, T. Takeuchi
    Mater. Trans., in press.

  2. [New!] Enhanced Near-Room-Temperature Thermoelectric Properties in Yb-Doped Off-Stoichiometry α-Cu2+xSe
    A. K. R. Ang, S. Singh, K. Hirata, S. P. Chandrasekar, M. Matsunami, T. Takeuchi
    ACS Appl. Electron. Mater. (2026), published online [11 pages].

  3. [New!] Dopant size governs valence-band-edge splitting and hierarchical phonon scattering in Cu-and Ag-doped p-type ZnTe
    Sochannao Machinao, Dilip Kumar Meena, Neeraja Athulya, Subash Chandra Bose Rapaka, Saurabh Singh, Tsunehiro Takeuchi, Tamanna Kumari, Jasa Ram, Ramesh Karuppannan
    J. Phys. D: Appl. Phys. 59, 365501 (2026).

  4. [New!] Semiclassical thermoelectric transport in the disordered Dirac electron system Ag2Te
    K. Kuga, K. Hirata, D. Goto, R. Ishihara, M. Matsunami, and T. Takeuchi
    Phys. Rev. B 114, 154203 (2026) [6 pages].

  5. [New!] Tailoring thermoelectric transport in (La, Sm)-doubly filled skutterudite thin films via controlled annealing
    Cecilia Piscino, Anoop Divakaran, Pietro Manfrinetti, Tsunehiro Takeuchi, Cristina Artini, Paolo Mele, Giovanna Latronico
    Mater. Chem. Phys. 368, 1330033 (2026).

  6. [New!] 高性能p型Si-Ge系ナノ粒子化バルク熱電材料の開発
    石原崚伍，松波雅治, 竹内恒博
    日本熱電学会誌, 早期公開 (2026) [10 pages].

  7. Effect of the deposition temperature on the properties of MnFe2O4 thin films
    A. Giribaldi, A. M. Divakaran, P. Maltoni, H. Rijckaert, G. Latronico, C. Piscino, M. A. Lopez de la Torre, K. Iida, C. Giordani, T. Takeuchi, D. Peddis, C. Artini, P. Mele
    J. Alloy. Compd. 1074, 189111 (2026) [9 pages].

  8. Geometric decoupling of thickness and thermal gradient in wearable thermoelectric generators via a stair-shaped architecture
    Suresh Prasanna C, M. A. Ali, A. K. R. Ang, M. Matsunami, T. Takeuchi
    Chem. Eng. J. 539, 177006 (2026) [11 pages].

  9. Influence of transition-metal composition on anomalous Nernst effect in amorphous Tb–Fe–Co thin films
    H. Imaeda, T. Takeuchi, H. Awano, K. Tanabe
    J. Appl. Phys. Lett. 139, 093906 (2026) [11 pages].

  10. Heat Flow Switching Device Working with the Latent-Heat-Induced Heat-Pumping Phenomenon
    R. Toida, T. Maruchi, P. Lotfalinezhad, M. Adachi, T. Matsunaga, T. Fujita, K. Hirata, M. Matsunami, T. Takeuchi
    Mater. Trans. 67, 149 (2026) [8 pages].

  11. Development of an Electric Double-Layer Capacitor-Type Heat Flow Switching Device with Ag2S0.8Se0.2 as the Functional Electrode
    R. Toida, P. Lotfalinezhad, M. Adachi, T. Matsunaga, T. Fujita, K. Hirata, M. Matsunami, T. Takeuchi
    Mater. Trans. 67, 92 (2026) [7 pages].

2025

  1. Review of recent developments in capacitor-type heat flow switching devices
    K. Hirata, T. Takeuchi
    Sci. Tech. Adv. Mater. 26, 2590797 (2025) [11 pages].

  2. Evidence for energy-dependent scattering dominating thermoelectricity in heavy fermion systems
    D. Goto, K. Kuga, K. Tanaka, T. Takeuchi, M. Matsunami
    Appl. Phys. Lett. 127, 161903 (2025) [5 pages].

  3. Enhanced rectification effect in silver chalcogenide-based thermal diode by using precipitation/dissolution of Ag impurity across the structure phase transition
    K. Hirata, Y. Goto, T. Takeuchi
    Sci. Tech. Adv. Mater. 26, 2549674 (2025) [12 pages].

  4. 潜熱誘起熱ポンピング現象を利用した熱流スイッチング素子
    樋田怜史, 丸地智也，Peyman Lotfalinezhad, 安達真樹，松永卓也，藤田利晃，平田圭佑，松波雅治，竹内恒博
    日本熱電学会誌 22, 13-19 (2025) [7 pages].

  5. Development of High-Performance Nano-Grained Bulk Silicon-Germanium Thermoelectric Materials by Co-Sintering with Titanium
    R. Ishihara, K. Hirata, M. Matsunami, T. Takeuchi
    Mater. Trans. 66, 1114 (2025) [7 pages].
    ［公開データ（zip形式） ※機関リポジトリに移行予定］

  6. The asymmetric Fermi surface of Bi2201
    S. Smit, K. L. Shirkoohi, S. Mukherjee, S. B. Pierantoni, L. Bawden, E. van Heumen, A. P. N. Tchiomo, J. Henke, J. van Wezel, Y. Huang, T. Kondo, T. Takeuchi, T. Kim, C. Cacho, M. Zonno, S. Gorovikov, S. B. Dugdale, J. I Facio, M. Roslova, L. Folkers, A. Isaeva, N. Hussey, M. Golden
    SciPost Phys. 18, 191 (2025) [7 pages].

  7. Ag2S0.8Se0.2を機能電極とする電気二重層型熱流スイッチング素子の開発
    樋田怜史, Peyman Lotfalinezhad, 安達真樹，松永卓也，藤田利晃，平田圭佑， 松波雅治，竹内恒博
    日本熱電学会誌 22, 3-7 (2025) [5 pages].

  8. Coupling of magnetism and transport properties to the lattice degrees of freedom in NdBaCo2O5+δ (δ ~ 0.65)
    H. Pant, S. Singh, J. Brar, P. Sharma, M. Bharath, K. Kuga, T. Takeuchi, R. Bindu
    J. Phys.: Condens. Matter 37, 135603 (2025) [13 pages].

  9. The new PrNi6Si6 intermetallic: from crystal structure to thermal and electrical transport properties across a wide temperature range (2–900 K)
    S. Singh, A. Provino, I. Pallecchi, F. Caglieris, M. Mödlinger, P. Mele, G. Latronico, T. Takeuchi, P. Manfrinetti
    J. Mater. Sci. 60, 3940-3956 (2025).

  10. 酸化を抑制した高性能Si-Ge系ナノバルク熱電材料の開発
    石原崚伍，平田圭佑，松波雅治, 竹内恒博
    日本熱電学会誌 21, 141-146 (2025) [6 pages].
    ［公開データ（zip形式） ※機関リポジトリに移行予定］

2024

  1. Universal correlation between H-linear magnetoresistance and T-linear resistivity in high-temperature superconductors
    J. Ayres, M. Berben, C. Duffy, R. D. H. Hinlopen, Y.-T. Hsu, A. Cuoghi, M. Leroux, I. Gilmutdinov, M. Massoudzadegan, D. Vignolles, Y. Huang, T. Kondo, T. Takeuchi, S. Friedemann, A. Carrington, C. Proust, and N. E. Hussey
    Nat. Commun. 15, 8406 (2024) [7 pages].

  2. Understanding the Anomalous Thermoelectric Behavior of Fe-V-W-Al-Based Thin Films
    K. Yadav, Y. Tanaka, A. K. Ang, K. Hirose, M. Adachi, M. Matsunami, and T. Takeuchi
    ACS Appl. Mater. Interfaces 16, 50576 (2024) [11 pages].
    ［公開データ（zip形式） ※機関リポジトリに移行予定］

  3. Significant improvement in sensitivity of an anomalous Nernst heat flux sensor by composite structure
    H. Imaeda, R. Toida, T. Takeuchi, H. Awano, and K. Tanabe
    Appl. Phys. Lett. 125, 044101 (2024) [6 pages].

  4. Momentum-dependent scaling exponents of nodal self-energies measured in strange metal cuprates and modelled using semi-holography
    S. Smit, E. Mauri, L. Bawden, F. Heringa, F. Gerritsen, E. van Heumen, Y. K. Huang, T. Kondo, T. Takeuchi, N. E. Hussey, M. Allan, T. K. Kim, C. Cacho, A. Krikun, K. Schalm, H.T.C. Stoof, and M. S. Golden
    Nat. Commun. 15, 4581 (2024) [8 pages].

  5. Tunable magnetoelectronic properties in Bi3+ substituted YCrO3
    S. K. Raya, A. Patia, P. Sahooa, A.K. Sahooa, S. Singh, T. Takeuchi, and S. Dasha
    Physica B 685, 416018 (2024) [8 pages].

  6. Structural study of crystalline and amorphous phases of Si0.65Ge0.35Bx (x = 0, 0.01, 0.05, 0.10) alloy prepared by long-time mechanical alloying
    S. Hiroi, K. Ohara, O. Muthusamy, H. Nakajima, S. Mori, and T. Takeuchi
    J. Non Cryst. Solids 631, 122914 (2024) [6 pages].
    ［公開データ（zip形式） ※機関リポジトリに移行予定］

  7. Revealing magnetic and physical properties of TbFe4.4Al7.6: experiment and theory
    S. S. Samatham, S. Singh, S. Sunil Kumar Reddy , S. Kumar A, S. Yadam, P. D. Babu, T. Takeuchi, and K. G. Suresh
    J. Phys.: Condens. Matter 36, 205802 (2024) [10 pages].

  8. Metaheuristic aided structural topology optimization method for heat sink design with low electromagnetic interference
    M. Al Ali, M. Shimoda, B. Benaissa, M. Kobayashi, T. Takeuchi, A. Al-Shawk, and S. Ranjbar
    Sci. Rep. 14, 3431 (2024) [15 pages].

  9. Composition, time, temperature, and annealing-process dependences of crystalline and amorphous phases in ductile semiconductors Ag2S1-xTex with x = 0.3-0.6
    K. Sato, K. Hirata, M. Matsunami, and T. Takeuchi
    AIP Adv. 14, 015303 (2024) [9 pages].
    ［公開データ（zip形式） ※機関リポジトリに移行予定］

2023

  1. Improvement of thermoelectric performance of flexible compound Ag2S0.55Se0.45 by means of partial V-substitution for Ag
    K. Sato, S. Singh, I. Yamazaki, K. Hirata, A. K. Ang, M. Matsunami, and T. Takeuchi
    AIP Adv. 13, 125206 (2023) [9 pages].

  2. Huge Peltier conductivity in valence fluctuating material Yb3Si5
    K. Kuga, K. Hirata, M. Matsunami, and T. Takeuchi
    Appl. Phys. Lett. 123, 202201 (2023) [5 pages].

  3. Reduction of working temperature for the large magnitude in thermoelectric dimensionless figure of merit of Ag2-xCuxS
    K. Sato, G. Kim, K. Murase, S. Singh, K. Hirata, D. Byeon, M. Matsunami, and T. Takeuchi
    Jpn. J. Appl. Phys. 62, 111002 (2023) [8 pages].
    [Congrats!] Selected as Spotlights 2023 in JJAP.

  4. Development of Cu2Se/Ag2(S,Se)-Based Monolithic Thermoelectric Generators for Low-Grade Waste Heat Energy Harvesting
    A. K. R. Ang, I. Yamazaki, K. Hirata, S. Singh, M. Matsunami, and T. Takeuchi
    ACS Appl. Mater. Interfaces 15, 46962 (2023) [9 pages].

  5. First‐Principles Study on Electronic and Thermal Transport Properties of FeRuTiX Quaternary Heusler Compounds (X= Si, Ge, Sn)
    S. Singh, S. Singh, B. Srinivasan, A. Kumar, N. Bijewar, T. Mori, T. Takeuchi, J.-f. Halet
    Z. Anorg. Allg. Chem. 649, e202300080 (2023) [9 pages].

  6. Orbital hybridisation effects in B2 phase Cr doped Co2MnAl
    S. Pathak, S. Singh, S. Khalid, K. Kuga, T. Takeuchi, R. Bindu
    J. Phys.: Condens. Matter 35, 395401 (2023) [10 pages].

  7. Thermoelectric performance of Fe2V0.9W0.1Al thin films deposited on n-type Si substrates
    F. Machda, S. Singh, K. Kuga, A. K. R. Ang, M. Matsunami, and T. Takeuchi
    Jpn. J. Appl. Phys. 62, 055502 (2023) [8 pages].

  8. Lattice effects on the physical properties of half-doped perovskite ruthenates
    J. Brar, S. Singh, K. Kuga, P. Sharma, M. Bharath, T. Takeuchi, and R. Bindu
    J. Phys.: Condens. Matter 35, 195402 (2023) [11 pages].

  9. Nanostructured Si–Ge thermoelectric material for 1200 V/W highly sensitive infrared thermopile sensor device
    K. Kakuyama, K. Hirose, M. Adachi, T. Takeuchi, and M. Kimata
    AIP Adv. 13, 035128 (2023) [4 pages].

  10. Significantly reduced lattice thermal conductivity with anharmonic lattice vibrations and band edge effect in electronic thermal conductivity in Ag2S1-xSex (0 ≤ x ≤ 0.6)
    K. Hirata, S. Singh, and T. Takeuchi
    AIP Adv. 13, 035122 (2023) [10 pages].
    [Congrats!] Selected as Featured article.

  11. Puddle formation and persistent gaps across the non-mean-field breakdown of superconductivity in overdoped (Pb,Bi)2Sr2CuO6+δ
    W. O. Tromp, T. Benschop, J.-F. Ge, I. Battisti, K. M. Bastiaans, D. Chatzopoulos, A. H. M. Vervloet, S. Smit, E. van Heumen, M. S. Golden, Y. Huang, T. Kondo, T. Takeuchi, Y. Yin, J. E. Hoffman, M. A. Sulangi, J. Zaanen, and M. P. Allan
    Nature Materials 22, 703-709 (2023) [8 pages].

  12. Thermal conduction in titanium-chromium oxide natural superlattices with an ordered arrangement of nearly pristine interfaces
    S. Sugimoto, G. Kim, T. Takeuchi, M. Tagawa, T. Ujihara, and S. Harada
    J. Alloys Compd. 934, 167915 (2023).

  13. Effect of the annealing treatment on structural and transport properties of thermoelectric Smy(FexNi1−x)4Sb12 thin films
    G. Latronico, P. Mele, C. Sekine, P. S. Wei, S. Singh, T. Takeuchi, C. Bourgès, T. Baba, T. Mori, P. Manfrinetti, and C. Artini
    Nanotechnology 34, 115705 (2023) [12 pages].

  14. Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te
    K. Hirata, K. Kuga, M. Matsunami, M. Zhu, J. P. Heremans, and T. Takeuchi
    AIP Adv. 13, 015016 (2023) [9 pages].
    [Congrats!] Featured on the cover of ADV's January 2023 issue.

  15. Valence fluctuation in Yb3Si5 probed by synchrotron x-ray photoemission spectroscopy
    K. Kuga, M. Matsunami, H. Fujiwara, G. Nosue, A. Ose, A. Sekiyama, A. Yasui, S. Hamamoto, M. Oura, and T. Takeuchi
    Jpn. J. Appl. Phys. 62, SD1014 (2023) [4 pages].

2022

  1. Thermoelectric properties of higher manganese silicide consolidated by flash spark plasma sintering technique
    S. Choi, K. Kubo, N. Uchiyama, and T. Takeuchi
    J. Alloys Compd. 921, 166104 (2022).

  2. Multicritical phase diagram of PrMn1−xSb2 with two interacting magnetic elements
    T. Urata, Y. Takahashi, K. Kuga, T. Takeuchi, and H. Ikuta
    Phys. Rev. B 106, 184401 (2022) [6 pages].

  3. Large antiferromagnetic fluctuation enhancement of the thermopower at a critical doping in magnetic semimetal
    A. Mohamed, Y. Fujisawa, T. Onishi, M. Pardo-Almanza, M. Couillard, K. Harada, T. Takeuchi, and Y. Okada
    Phys. Rev. B 106,155122 (2022) [7 pages].

  4. Synthesis and structural link to the electronic and magneto-transport properties of spin–orbit Mott insulator Sr2IrO4
    P. Sharma, S. Singh, K. Kuga, T. Takeuchi, and R. Bindu
    J. Phys.: Condens. Matter 34, 435402 (2022) [9 pages].

  5. Strange metal electrodynamics across the phase diagram of cuprates
    E. van Heumen, X. Feng, S. Cassanelli, L. Neubrand, L. de Jager, M. Berben, Y. Huang, T. Kondo, T. Takeuchi, and J. Zaanen
    Phys. Rev. B 106, 054515 (2022) [18 pages].

  6. Enhanced Performance of Monolithic Chalcogenide Thermoelectric Modules for Energy Harvesting via Co-optimization of Experiment and Simulation
    H. Lai, S. Singh, Y. Peng, K. Hirata, M. Ryu, A. K. R. Ang, L. Miao, and T. Takeuchi
    ACS Appl. Mater. Interfaces 14, 38642–38650 (2022) [9 pages].

  7. Electronic structure of silver chalcogenides investigated by hard x-ray photoemission spectroscopy and density functional theory calculations
    K. Sato, K. Hirata, S. Singh, K. Kuga, F. Ogawa, M. Matsunami, and T. Takeuchi
    J. Appl. Phys. 132, 045104 (2022) [5 pages].

  8. Magnetic behavior of Ru substituted skyrmion metal MnSi
    S. S. Samatham, S. Singh, A. K. Patel, S. S. K. Reddy, T. Takeuchi, and K. G. Suresh
    J. Phys.: Condens. Matter 34, 345801 (2022) [8 pages].

  9. Unravelling the phonon scattering mechanism in half-Heusler alloys ZrCo1−xIrxSb (x= 0, 0.1 and 0.25)
    K. Yadav, S. Singh, O. Muthuswamy, T. Takeuchi, and K. Mukherjee
    J. Phys.: Condens. Matter 34, 035702 (2022) [6 pages].

  10. Anomalous dependence of thermoelectric parameters on carrier concentration and electronic structure in Mn-substituted Fe2CrAl Heusler alloy
    K. Yadav, S. Singh, O. Muthuswamy, T. Takeuchi, and K. Mukherjee
    Phil. Mag. 102, 357-374 (2022) [18 pages].

2021

  1. Synergetic Enhancement of the Power Factor and Suppression of Lattice Thermal Conductivity via Electronic Structure Modification and Nanostructuring on a Ni- and B-Codoped p-Type Si-Ge Alloy for Thermoelectric Application
    O. Muthusamy, S. Singh, K. Hirata, K. Kuga, S. K. Harish, M. Shimomura, M. Adachi, Y. Yamamoto, M. Matsunami, and T. Takeuchi
    ACS Appl. Electron. Mater. 3, 5621-5631 (2021) [11 pages].

  2. Simultaneous enhancements of thermopower and electrical conductivity in quasi-one-dimensional α-YbAlB4 single crystal
    K. Kuga, M. Matsunami, S. Singh, S. Nakatsuji, and T. Takeuchi
    Appl. Phys. Lett. 119, 223905 (2021) [6 pages].

  3. Capacitor-Type Thin-Film Heat Flow Switching Device
    K. Hirata, T. Matsunaga, S. Singh, M. Matsunami, and T. Takeuchi
    Jpn. J. Appl. Phys. 60, 124004 (2021) [7 pages].

  4. Synthesis and Characterization of Al-and SnO2-Doped ZnO Thermoelectric Thin Films
    G. Latronico, S. Singh, P. Mele, A. Darwish, S. Sarkisov, S. W. Pan, Y. Kawamura, C. Sekine, T. Baba, T. Mori, T. Takeuchi, A. Ichinose, S. Wilson
    Materials 14, 6929 (2021) [17 pages]

  5. Investigation on the power factor of skutterudite smy (FexNi1-x)4Sb12 thin films: Effects of deposition and annealing temperature
    G. Latronico, P. Mele, C. Artini, P. Manfrinetti, S. W. Pan, Y. Kawamura, C. Sekine, S. Singh, T. Takeuchi, T. Baba, C. Bourgès, T. Mori
    Materials 14, 5773 (2021) [15 pages]

  6. Reinforcement of power factor in N-type multiphase thin film of Si1−x−yGexSny by mitigating the opposing behavior of Seebeck coefficient and electrical conductivity
    H. Lai, Y. Peng, J. Gao, H. Song, M. Kurosawa, O. Nakatsuka, T. Takeuchi, L. Miao
    Appl. Phys. Lett. 119, 113903 (2021) [6 pages].

  7. Incoherent transport across the strange-metal regime of overdoped cuprates
    J. Ayres, M. Berben, M. Čulo, Y-T. Hsu, E. van Heumen, Y. Huang, J. Zaanen, T. Kondo, T. Takeuchi, J. R. Cooper, C. Putzke, S. Friedemann, A. Carrington, N. E. Hussey
    Nature 595, 661-666 (2021) [22 pages].

  8. Reduced Hall carrier density in the overdoped strange metal regime of cuprate superconductors
    C. Putzke, S. Benhabib, W. Tabis, J. Ayres, Z. Wang, L. Malone, S. Licciardello, J. Lu, T. Kondo, T. Takeuchi, N. E. Hussey, J. R. Cooper, A. Carrington
    Nat. Phys. 17, 826–831 (2021) [5 pages].

  9. Anomalous vortex liquid in charge-ordered cuprate superconductors
    Yu-Te Hsu, Maarten Berben, Matija Čulo, Seiji Adachi, Takeshi Kondo, Tsuneshiro Takeuchi, Yue Wang, Steffen Wiedmann, Stephen M. Hayden, and Nigel E. Hussey
    Proc. Natl. Acad. Sci. U.S.A. 118, e2016275118 (2021) [6 pages].

  10. Mixed-phase effect of the high Seebeck coefficient and low electrical resistivity in the Ag2S
    G. Kim. D. Byeon, S. Singh, K. Hirata, S. Choi, M. Matsunami, and T. Takeuchi
    J. Phys. D: Appl. Phys. 54, 115503 (2021) [7 pages].

  11. A Field Effect Heat Flow Switching Device
    T. Matsunaga, K. Hirata, S. Singh, M. Matsunami, and T. Takeuchi
    Mater. Trans. 62, 16-19 (2021) [4 pages].

2020

  1. Development of High-Performance Solid-State Thermal Diodes Using Unusual Behavior of Thermal Conductivity Observed for Ag2Ch (Ch = S, Se, Te)
    K. Hirata, T. Matsunaga, S. Singh, M. Matsunami, and T. Takeuchi
    Mater. Trans. 61, 2402-2406 (2020) [5 pages].

  2. Crossover in periodic length dependence of thermal conductivity in 5d element substituted Fe2VAl-based superlattices
    S. Choi, S. Hiroi, M. Inukai, S. Nishino, R. Sobota, D. Byeon, M. Mikami, E. Minamitani, M. Matsunami, and T. Takeuchi
    Phys. Rev. B 102, 104301 (2020) [10 pages].

  3. High Dimensionless Figure of Merit ZT = 1.38 Achieved in p-Type Si–Ge–Au–B Thin Film
    M. Adachi, S. Nishino, K. Hirose, M. Kiyama, Y. Yamamoto, and T. Takeuchi
    Mater. Trans. 61, 1014-1019 (2020) [6 pages].

  4. Effects of 5d-heavy element partial substitution on thermal transport in Fe2VAl thin films
    S. Choi, S. Hiroi, M. Inukai, S. Nishino, R. Sobota, D. Byeon, M. Mikami, M. Matsunami, and T. Takeuchi
    Phys. Rev. B 101, 104312 (2020) [8 pages].

  5. Dynamical variation of carrier concentration and colossal Seebeck effect in Cu2S low-temperature phase
    D. Byeon, R. Sobota, K. Hirata, S. Singh, S. Choi, M. Adachi, Y. Yamamoto, M. Matsunami, and T. Takeuchi
    J. Alloys Compd. 826, 154155 (2020) [6 pages].

  6. Cooling-free infrared sensors with high-performance thermoelectric materials
    K. Hirose, M. Adachi, M. Murata, Y. Yamamoto, and T. Takeuchi
    Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 112880I (31 January 2020).

  7. Hard x-ray photoemission spectroscopy of rhenium substituted higher manganese silicides
    M. Matsunami, T. Iizuka, S. Ghodke, A. Yamamoto, H. Miyazaki, and T. Takeuchi
    J. Appl. Phys. 127, 053103 (2020) [5 pages].

  8. High-Performance Solid-State Thermal Diode Consisting of Ag2(S,Se,Te)
    K. Hirata, T. Matsunaga, S. Singh, M. Matsunami, and T. Takeuchi
    Proceedings of International Conference on Thermoelectrics (ICT 2019)
    J. Elec. Mater. 49, 2895-2901 (2020) [7 pages].

  9. Long-term stability of the colossal Seebeck effect in metallic Cu2Se
    D. Byeon, R. Sobota, S. Singh, S. Ghodke, S. Choi, N. Kubo, M. Adachi, Y. Yamamoto, M. Matsunami, and T. Takeuchi
    Proceedings of International Conference on Thermoelectrics (ICT 2019)
    J. Elec. Mater. 49, 2855-2861 (2020) [7 pages].

  10. Investigation of Thermoelectric Properties of Ag2SxSe1-x (x = 0.0, 0.2 and 0.4)
    S. Singh, K. Hirata, D. Byeon, T. Matsunaga, O. Muthusamy, S. Ghodke, M. Adachi, Y. Yamamoto, M. Matsunami, and T. Takeuchi
    Proceedings of International Conference on Thermoelectrics (ICT 2019)
    J. Elec. Mater. 49, 2846-2854 (2020) [9 pages].

  11. Enhancement of the Thermoelectric Performance of Si-Ge Nanocomposites Containing a Small Amount of Au and Optimization of Boron Doping
    O. Muthusamy, S. Ghodke, S. Singh, K. Delime-Codrin, S. Nishino, M. Adachi, Y. Yamamoto, M. Matsunami, S. Harish, M. Shimomura, and T. Takeuchi
    Proceedings of International Conference on Thermoelectrics (ICT 2019)
    J. Elec. Mater. 49, 2813-2824 (2020) [12 pages].

  12. Thermoelectric Properties of Yb5Si3
    T. Iizuka, T. Hori, M. Matsunami, and T. Takeuchi
    Jpn. J. Appl. Phys. 59, 010902 (2020) [3 pages].

2019

  1. Au and B co-doped p-type Si-Ge nanocomposites possessing ZT = 1.63 synthesized by ball milling and low-temperature sintering
    Muthusamy Omprakash, Kévin Delime-Codrin, Swapnil Ghodke, Saurabh Singh, Shunsuke Nishino, Yoshiyuki Yamamoto, Masaharu Matsunami, Harish Santhanakrishnan, Masaru Shimomura, Tsunehiro Takeuchi
    Jpn. J. Appl. Phys. 58, 125501 (2019) [9 pages].

  2. バイアス電圧で制御する熱流スイッチング素子の創製
    松永卓也, 平田圭佑, Saurabh Singh, 松波雅治, 竹内恒博
    日本熱電学会誌 16, 73-76 (2019) [4 pages].

  3. Improved Thermoelectric Properties of Re-Substituted Higher Manganese Silicides by Inducing Phonon Scattering and an Energy-Filtering Effect at Grain Boundary Interfaces
    Swapnil Ghodke, Akio Yamamoto, Hsuan-Chun Hu, Shunsuke Nishino, Takuya Matsunaga, Dogyun Byeon, Hiroshi Ikuta, Tsunehiro Takeuchi
    ACS Appl. Mater. Interfaces 11, 31169 (2019) [8 pages].

  4. Ag2Ch (Ch=S, Se, Te) の異常な熱伝導度と それを利用した固体熱整流素子の開発
    平田圭佑, Saurabh Singh, 松永卓也, 松波雅治, 竹内恒博
    日本熱電学会誌 16, 3-7 (2019) [5 pages].

  5. Fabrication of ultrathin poly-crystalline SiGe-on-insulator layer for thermoelectric applications
    C.P. Goyal, M. Omprakash, M. Navaneethan, T. Takeuchi, Y. Shimura, M. Shimomura, S. Ponnusamy, Y. Hayakawa, H. Ikeda
    J. Phys. Commun. 3, 075007 (2019).

  6. Effect of Different Processing Routes on the Power Factor of the Filled Skutterudite Smy(FexNi1-x)4Sb12 (x = 0.50-0.80; y = 0.12-0.53)
    Cristina Artini, Giovanna Latronico, Riccardo Carlini, Shrikant Saini, Tsunehiro Takeuchi, Seongho Choi, Angelica Baldini, Umberto Anselmi-Tamburini, Fabrizio Valenza, Palo Mele
    ES Mater. Manuf. 5, 29-37 (2019).

  7. Effect of Re Substitution on the Phase Stability of Complex MnSiγ
    S. Ghodke, R. Sobota, D. Berthebaud, P-Y. Pichon, C. Navone, and T. Takeuchi
    J. Electron. Mater. 48, 5827 (2019) [8 pages].

  8. Phonon scattering at the interfaces of epitaxially grown Fe2VAl/W and Fe2VAl/Mo superlattices
    S. Hiroi, S. Nishino, S. Choi, O. Seo, J. Kim, Y. Chen, C. Song, A. Tayal, O. Sakata, and T. Takeuchi
    J. Appl. Phys. 125, 225101 (2019) [7 pages].

  9. Phase Diagram of Bi2Sr2CaCu2O8+δ Constructed on Basis of Electronic Structure Investigations
    R. Sobota, N. Kubo, M. Matsunami, and T. Takeuchi
    J. Phys. Soc. Jpn. 88, 064711 (2019) [7 pages].

  10. Large figure of merit ZT = 1.88 at 873 K achieved with nanostructured Si0.55Ge0.35(P0.10Fe0.01)
    K. Delime-Codrin, M. Omprakash, S. Ghodke, R. Sobota, M. Adachi, M. Kiyama, T. Matsuura, Y. Yamamoto, M. Matsunami, and T. Takeuchi
    Appl. Phys. Express 12, 045507 (2019) [6 pages].

  11. Density Wave Probes Cuprate Quantum Phase Transition
    Tatiana A. Webb, Michael C. Boyer, Yi Yin, Debanjan Chowdhury, Yang He, Takeshi Kondo, T. Takeuchi, H. Ikuta, Eric W. Hudson, Jennifer E. Hoffman, and Mohammad H. Hamidian
    Phys. Rev. X 9, 021021 (2019) [10 pages].

  12. Discovery of Colossal Seebeck Effect in Metallic Cu2Se
    D. Byeon, R. Sobota, K. Delime-Codrin, S. Choi, K. Hirata, M. Adachi, M. Kiyama, T. Matsuura, Y. Yamamoto, M. Matsunami, and T. Takeuchi
    Nat. Commun. 10, 72 (2019) [7 pages].

  13. Synthesis, crystal structure and physical properties of Yb2Pd3Ge5
    R. Freccero, S. H. Choi, P. Solokha, S. De Negri, T. Takeuchi, S. Hirai, P. Mele, and A. Saccone
    J. Alloys Compounds 783, 601-607 (2019) [7 pages].

  14. Direct observation of pseudo-gap electronic structure in the Heusler-type Fe2VAl thin film
    H. Miyazaki, S. Tateishi, M. Matsunami, K. Soda, S. Yamada, K. Hamaya, and Y. Nishino
    J. Electron Spectrosc. Rel. Phenom. 232, 1 (2019) [4 pages].

  15. Optimization of thermoelectric properties achieved in Cu doped β-In2S3 bulks
    Yue-Xing Chen, Fu Li, Wenting Wang, Zhuanghao Zheng, Jingting Luo, Ping Fan, TsunehiroTakeuchi
    J. Alloys Compounds 782, 641-647 (2019) [7 pages].

  16. Effects of Re substitution for Mn on microstructures and properties in Re-substituted higher manganese silicide thermoelectric material
    T. Homma, T. Kamata, N. Saito, S. Ghodke, T. Takeuchi
    J. Alloys Compounds 776, 8-15 (2019) [8 pages].

2018

  1. Antiferromagnetic order is possible in ternary quasicrystal approximants
    A. Ishikawa, T. Fujii, T. Takeuchi, T. Yamada, Y. Matsushita, and R. Tamura
    Phys. Rev. B 98, 220403(R) (2018) [4 pages].

  2. Effective Decrease of the Thermal Conductivity Caused by Hf in Fe(V0.955-xHf0.045Tix)Sb Half-Heusler Phase
    K. Delime-Codrin, G. Swapnil, D. Byeon, R. Sobota, M. Matsunami and T. Takeuchi
    Mater. Trans. 59, 1637 (2018) [8 pages].

  3. Influence of Au on Ge Crystallization and Its Thermoelectric Properties in a Au-induced Ge Crystallization Technique
    S. Shanthi, K. Faizan, S. Nishino, M. Omprakash, T. Takeuchi, Y. Shimura, Y. Hayakawa, C. Muthamizhchelvan, and H. Ikeda
    J. Adv. Phys. 14, 5460-5466 (2018) [7 pages].

  4. Discovery of superconductivity in quasicrystal
    K. Kamiya, T. Takeuchi, N. Kabeya, N. Wada, T. Ishimasa, A. Ochiai, K. Deguchi, K. Imura and N. K. Sato
    Nat. Commun. 9, 154 (2018) [8 pages].

  5. Thermoelectric Properties of Nanograined Si-Ge-Au Thin Films Grown by Molecular Beam Deposition
    S. Nishino, S. Ekino, M. Inukai, M. Omprakash, M. Adachi, M. Kiyama, Y. Yamamoto, and T. Takeuchi
    Proceedings of International Conference on Thermoelectrics 2017
    J. Electron. Mater. 47 (2018), 3267–3272.

  6. Low Thermal Conductivity of Bulk Amorphous Si1−xGex Containing Nano-Sized Crystalline Particles Synthesized by Ball-Milling Process
    O. Muthusamy, S. Nishino. S. Ghodke, M. Inukai, R. Sobota, M. Adachi, M. Kiyama, Y. Yamamoto, T. Takeuchi, H. Santhanakrishnan, H. Ikeda, Y. Hayakawa
    Proceedings of International Conference on Thermoelectrics 2017
    J. Electron. Mater. 47 (2018), 3260–3266.

  7. High-Throughput Screening of Sulfide Thermoelectric Materials Using Electron Transport Calculations with OpenMX and BoltzTraP
    M. Miyata, T. Ozaki, T. Takeuchi, S. Nishino, M. Inukai, M. Koyano
    Proceedings of International Conference on Thermoelectrics 2017
    J. Electron. Mater. 47 (2018), 3254–3259.

  8. Analyzing the Boundary Thermal Resistance of Epitaxially Grown Fe2VAl/W Layers by Picosecond Time-Domain Thermoreflectance
    S. Hiroi, S. Choi, S. Nishino, O. Seo, Y. Chen, O. Sakata, T. Takeuchi
    Proceedings of International Conference on Thermoelectrics 2017
    J. Electron. Mater. 47 (2018), 3113–3118.

2017

  1. Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants
    M. Matsunami, M. Oura, K. Tamasaku, T. Ishikawa, S. Ideta, K. Tanaka, T. Takeuchi, T. Yamada, A. P. Tsai, K. Imura, K. Deguchi, N. K. Sato, and T. Ishimasa
    Phys. Rev. B 96, 241102(R) (2017) [4 pages].

  2. Carrier concentration dependence of thermoelectric properties of Fe(V1-x,Tix)Sb half-Heusler phase
    K. Delime-Codrin, T. Yamada, A. Yamamoto, R. Sobota, M. Matsunami, and T. Takeuchi
    Jpn. J. Appl. Phys. 56, 111202 (2017) [5 pages].

  3. First Observation of Heavy-Fermion Nature in Ce-based Icosahedral Approximant
    K. Imura, K. Nobe, K. Deguchi, M. Matsunami, H. Miyazaki, A. Yasui, E. Ikenaga, and N. K. Sato
    J. Phys. Soc. Jpn. 86, 093702 (2017) [4 pages].

  4. Superconducting gap of heavily underdoped copper oxide superconductor (Bi,Pb)2Sr2(Ca,Y)Cu2O8+δ
    H. Sakamoto, T. Kondo, S. Shin, M. Matsunami, H. Ikuta, and T. Takeuchi
    Proceedings of the “39th International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX-2016)
    J. Electron Spectrosc. Rel. Phenom. 220, 54 (2017) [4 pages].

  5. Enhancement of power factor by energy filtering effect in hierarchical BiSbTe3 nanostructures for thermoelectric applications
    M. Sabarinathana, M. Omprakash, S. Harish, M. Navaneethan, J. Archana, S. Ponnusamy, H. Ikeda, T. Takeuchi, C. Muthamizhchelvan, and Y. Hayakawa
    Appl. Surf. Sci. 418, 246-251 (2017).

  6. Doping effects of Mg for In on the thermoelectric properties of β-In2S3 bulk samples
    Y.-X. Chen, A. Yamamoto, and T. Takeuchi
    J. Alloys Compounds 695, 1631-1636 (2017).

  7. Thermoelectric properties of p-type Cr doped MnSiγ prepared by liquid quenching technique
    S. Ghodke, A. Yamamoto, M. Omprakash, H. Ikuta, and T. Takeuchi
    Mater. Trans. 58, 160-163 (2017).

  8. The Potential of FeVSb Half-Heusler Phase for Practical Thermoelectric Material
    A. Yamamoto and T. Takeuchi
    J. Electron. Mater. 46, 3200-3206 (2017) [6 pages].

2016

  1. Thickness dependence of thermal conductivity and electron transport properties of Fe2VAl thin-films prepared by RF sputtering technique
    S. Hiroi, M. Mikami, K. Kitahara, and T. Takeuchi
    International Journal of Nanotechnology 13, 881 (2016) [10 pages].

  2. Time-resolved HAXPES using a microfocused XFEL beam: From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics
    L.-P. Oloff, A. Chainani, M. Matsunami, K. Takahashi, T. Togashi, H. Osawa, K. Hanff, A. Quer, R. Matsushita, R. Shiraishi, M. Nagashima, A. Kimura, K. Matsuishi, M. Yabashi, Y. Tanaka, G. Rossi, T. Ishikawa, K. Rossnagel, and M. Oura
    Sci. Rep. 6, 35087 (2016) [10 pages].

  3. Carrier Concentration Dependence of Superconducting Gap of Bi2(Sr, La)2CuO6+δ
    H. Sakamoto, K. Ogawa, T. Kondo, S. Shin, M. Matsunami, H. Ikuta, and T. Takeuchi
    J. Phys. Soc. Jpn. 85, 104710 (2016) [7 Pages].

  4. Thermoelectric Properties of Fe2VAl-Based Thin-Films Deposited at High Temperature
    S. Hiroi, M. Mikami and T. Takeuchi
    Mater. Trans. 57, 1628 (2016) [5 pages].

  5. The Potential of Maximal ZT-Value for Thermoelectric Materials of Mn11Si19 HMS Phase by Calculating Electronic Structure
    A. Yamamoto, K. Kitahara, H. Miyazaki, M. Inukai, and T. Takeuchi
    Proceedings of 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications
    Ceramics for Energy Conversion, Storage, and Distribution Systems: Ceram. Trans. 255, 147 (2016) [10 pages].

  6. Thermoelectric Properties Higher Manganese Silicide Containing Small Amount of MnSi/Si Nano­Particles
    Swapnil Ghodke, A. Yamamoto, H. Ikuta, T. Takeuchi
    Proceedings of 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications
    Ceramics for Energy Conversion, Storage, and Distribution Systems: Ceram. Trans. 255, 115 (2016) [8 pages].

  7. Development of Thermoelectric Materials Consisting Solely of Environmental Friendly Elements
    T. Takeuchi, A. Yamamoto and S. Ghodke
    Mater. Trans. 57, 1029 (2016) [6 pages]. (Review article)

  8. Thermoelectric Properties of Al-Mn-Si Based C54 Phase Containing Small Amount of C40 Phase
    A. Yamamoto, S. Ghodke, H. Miyazaki, Y. Nishino, M. Matsunami and T. Takeuchi
    Mater. Trans. 57, 1055 (2016) [4 pages].

  9. Enhanced thermoelectric properties of W and Fe substituted MnSiγ
    S. Ghodke, N. Hiroishi, A. Yamamoto, H. Ikuta, M. Matsunami, and T. Takeuchi
    J. Electron. Mater. 45, 5279-5284 (2016) [6 pages].

  10. Slater to Mott Crossover in the Metal to Insulator Transition of Nd2Ir2O7
    M. Nakayama, Takeshi Kondo, Z. Tian, J.J. Ishikawa, M. Halim, C. Bareille, W. Malaeb, K. Kuroda, T. Tomita, S. Ideta, K. Tanaka, M. Matsunami, S. Kimura, N. Inami, K. Ono, H. Kumigashira, L. Balents, S. Nakatsuji, and S. Shin
    Phys. Rev. Lett. 117, 056403 (2016) [5 pages].

  11. Thermal Conductivity Measurement of Liquid-Quenched Higher Manganese Silicides
    S. Nishino, M. Miyata, K. Ohdaira, M. Koyano, and T. Takeuchi
    J. Electron. Mater. 45, 1821-1826 (2016) [6 pages].

  12. Thermoelectric properties of super-saturated Re solid solution of higher manganese silicides
    A. Yamamoto, S. Ghodke, H. Miyazaki, M. Inukai, Y. Nishino, M. Matsunami, and T. Takeuchi
    Jpn. J. Appl. Phys. 55, 020301 (2016) [4 pages].

2015

  1. Thermoelectric properties of β-Indium sulfide with sulphur deficiencies
    Y.-X. Chen, K. Kitahara, and T. Takeuchi
    J. Appl. Phys. 118, 245103 (2015) [8 pages].

  2. Point nodes persisting far beyond Tc in Bi2212
    Takeshi Kondo, W. Malaeb, Y. Ishida, T. Sasagawa, H. Sakamoto, Tsunehiro Takeuchi, T. Tohyama，and S. Shin
    Nat. Commun. 6, 7699 (2015) [8 pages].

  3. Pairing, pseudogap and Fermi arcs in cuprates
    A. Kaminski, T. Kondo, T. Takeuchi, and G. Gu
    Phil. Mag. 95, 453 (2015) [13 pages].

  4. Thermoelectric properties of Al–Mn–Si C40 phase containing small amount of W or Ta
    A. Yamamoto, H. Miyazaki, M. Inukai, Y. Nishino, and T. Takeuchi
    Jpn. J. Appl. Phys. 54, 071801 (2015) [9 pages].

  5. C40相を微量に含有するAl-Mn-Si基C54相の熱電特性
    山本晃生, 宮崎秀俊, 西野洋一, 竹内恒博
    日本金属学会誌 特集「熱電材料研究の新展開~新しい物性解析技術と新材料~」 79, 577 (2015) [4 pages].

2014

  1. Thermal Rectification in Bulk Material Through Unusual Behavior of Electron Thermal Conductivity of Al-Cu-Fe Icosahedral Quasicrystal
    R. Nakayama and T. Takeuchi
    J. Electron. Mater. 44, 356 (2014) [6 pages].

  2. Very large thermal rectification in bulk composites consisting partly of icosahedral quasicrystals
    T. Takeuchi
    Sci. Technol. Adv. Mater. 15, 064801 (2014) [8 pages].

  3. Fe2VAl-Based Thermoelectric Thin Films Prepared by a Sputtering Technique
    Y. Furuta, K. Kato, T. Miyawaki, H. Asano, and T. Takeuchi
    J. Electron. Mater. 43, 2157 (2014) [8 pages].

  4. Evaluation of the Thermoelectric Module Consisting of W-Doped Heusler Fe2VAl Alloy
    M. Mikami, M. Mizoshiri, K. Ozaki, H. Takazawa, A. Yamamoto, Y. Terazawa, and T. Takeuchi
    J. Electron. Mater. 43, 1922 (2014) [5 pages].

  5. Fermi Surface and Pseudogap Evolution in a Cuprate Superconductor
    Yang He, Yi Yin, M. Zech, Anjan Soumyanarayanan, Michael M. Yee, Tess Williams, M. C. Boyer, Kamalesh Chatterjee, W. D. Wise, I. Zeljkovic, Takeshi Kondo, T. Takeuchi, H. Ikuta, Peter Mistark, Robert S. Markiewicz, Arun Bansil, Subir Sachdev, E. W. Hudson, J. E. Hoffman
    Science 344, 608 (2014) [4 pages].

  6. Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re)
    A. Yamamoto, H. Miyazaki, and T. Takeuchi
    J. Appl. Phys. 115, 023708 (2014) [10 pages].

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