Takashi YAMAMOTO

Visiting Researcher


- Bachelor of Science, The University of Tokyo
- Master of Science, Graduate School of Science, The University of Tokyo
- Doctor of Science, Graduate School of Science, The University of Tokyo


- Institute for Molecular Science


- Charge ordering
- Spectroscopical analysis on molecular conductors
- Methodology to measure physical properties under the uni-axial extension


  1. M. Tanaka, K. Yamamoto, M. Uruichi, T. Yamamoto, K. Yakushi, S. Kimura, and H. Mori　New!
    "Infrared and Raman Study of the Charge-Ordered State in the Vicinity of the Superconducting State in the Organic Conductor β-(meso-DMBEDT-TTF)2PF6"
    J. Phys. Soc. Jpn., 77(2), 024714/1-024714/8 (2008).

  2. T. Yamamoto, R. Kato, H. M. Yamamoto, A. Fukaya, K. Yamasawa, I. Takahashi, H. Akutsu, A. Akutsu-Sato, and P. Day
    "Technique for anisotropic extension of organic crystals: Application to temperature dependence of electrical resistance"
    Rev. Sci. Instrum., 78, 083906/1-083906/11 (2007).

  3. T. Yamamoto, J. Eda, A. Nakao, R. Kato, and K. Yakushi
    "Charge ordered state and frustration of site charges in (ET)5Te2I6 and (BETS)5Te2I6"
    Phys. Rev. B, 75, 205132/1-205132/18 (2007).

  4. K. Torizuka, H. Tajima, and T. Yamamoto
    "Thermal Conductivity of (DMe-DCNQI)2Li1-xCux (x=1 and 0.75): Anomalous Temperature Hysteresis Depending on Cu Concentration"
    J. Phys. Soc. Jpn., 75(7), 074604 (2006).

  5. K. Yakushi, K. Suzuki, K. Yamamoto, T. Yamamoto, and A. Kawamoto
    "Unusual Electronic State of Layered θ-(ET)2X Studied by Raman Spectroscopy"
    J. Low Temperature Physics, 142(3/4), 659-662 (2006).

  6. M. Hiraoka, H. Sakamoto, K. Mizoguchi, R. Kato, T. Kato, T. Nakamura, K. Furukawa, K. Hiraki, T. Takahashi, T. Yamamoto, and H. Tajima
    "Electron Spin Dynamics in (DMe- DCNQI)2M (M=Li1-xCux(x<0.14), Ag)"
    J. Low Temperature Physics, 142(3/4), 617-620 (2006).

  7. T. Yamamoto, M. Uruichi, K. Yakushi, and A. Kawamoto
    "Charge ordering state of β"-(ET)3(HSO4)2 and β"-(ET)3(ClO4)2 by temperature-dependent infrared and Raman spectroscopy"
    Phys. Rev. B. 73, 125116 (2006).

  8. K. Torizuka, H. Tajima, Y. Kawamura, H. Sawa, and T. Yamamoto
    "Thermal transport of organic molecular crystals (DMe-DCNQI)2Li(1-x)Cux and observation of their super-lattice structure by means of synchrotron radiation X-ray"
    J. Phys. Chem. Sol., 66(8-9), 1575-1578 (2005).

  9. K. Torizukaa, H. Tajima, Y. Kawamura, H. Sawa, and T. Yamamoto
    "Thermal conductivity of (DMe-DCNQI)2Li1-xCux (0≦x≦0.14): Phonon propagation and the spin-Peierls lattice distortion"
    Phys. Rev. B, 71, 193101 (2005).

  10. T. Yamamoto, M. Uruichi, K. Yamamoto, K. Yakushi, A. Kawamoto, and H. Taniguchi
    "Examination of the Charge-Sensitive Vibrational Modes in Bis (ethylenedithio) tetrathiafulvalene"
    J. Phys. Chem. B., 109, 1522615235 (2005).

  11. A. F. Bangura, A. I. Coldea, J. Singleton, A. A. Ardavan, A. Akutsu-Sato, H. Akutsu, S. S. Turner, P. Day, T. Yamamoto, and K. Yakushi
    "Robust superconducting state in the low-quasiparticle-density organic metals β"-(BEDT-TTF)4[(H3O)M(C2O4)3]　Y: Superconductivity due to proximity to a charge-ordered state"
    Phys. Rev. B. 72, 014543 (2005).

  12. K. Yamamoto, T. Yamamoto, K. Yakushi, C. Pecile, and M. Meneghetti
    "Bond and charge-density waves in (DI-DCNQI)2Ag (DI-DCNQI=2,5-diiodo-N,N´-dicyanoquinonediimine) studied by single-crystal infrared and Raman spectroscopy"
    Phys. Rev. B. 71, 045118 (2005).

  13. T. Yamamoto, M. Uruichi, K. Yamamoto, K. Yakushi, and A. Kawamoto
    "Vibrational spectra of β"-(ET)3X2 (X=HSO4, ClO4) salts"
    Synth. Met. 155, 628-630 (2005).

  14. T. Yamamoto, K. Yakushi, Y. Shimizu, and G. Saito
    "Infrared and Raman study of the Charge-Ordered State of θ-(ET)2Cu2CN[N(CN)2]2"
    J. Phys. Soc. Jpn. 73, 2326 (2004).

  15. T. Yamamoto, M. Uruichi, K. Yakushi, J. Yamaura, and H. Tajima
    "Infrared and Raman evidence for the charge-ordering in β"-(BEDT-TTF)3(ReO4)2"
    Phys. Rev. B 70, 125102 (2004).

  16. T. Hatui, T. Yamamoto, H. Tajima, and N. Kosugi
    "Cu L2,3-edge X-ray absorption spectra of (2,5-dimethyl-N,N'-dicyanoquinonediimine)2Li1-xCux alloys"
    Chem. Phys, 298, 189-193 (2004).

  17. T. Yamamoto, M. Uruichi, K. Yakushi, J. Yamaura, H. Tajima, and A. Kawamoto
    "Charge disproportionate state of BEDT-TTF β"-salts"
    J. de Phys, 114, 397 (2004).

  18. T. Yamamoto, H. Tajima, K. Yakushi, M. Uruichi, and R. Kato
    "Thermoelectric Power and Raman spectra of (DMe-DCNQI)2Li1-xCux"
    Synth. Met., 133-134, 291-292 (2003).

  19. T. Yamamoto, H. Tajima, R. Kato, M. Uruichi, and K. Yakushi
    "Raman spectra of (DMe-DCNQI)2Li1-xCux: The Evidence for Charge Separation at Room Temperature in a One-Dimensional Conductor Having a Quarter-Filled Band"
    J. Phys. Soc. Jpn., 71, 1956-1964 (2002).

  20. T. Kawamoto, M. Ashizawa, T. Mori, T. Yamamoto, J. Yamaura, and H. Tajima
    "Anion Ordering and Opttical Properties of the Quai-One-Dimensional Organic Conductor (ChTM-TTP)2GaCl4"
    J. Phys. Soc. Jpn., 71, 3059 (2002).

  21. H. Yoshino, T. Konoike, K. Murata, G. C. Papavassiliou, T. Sasaki, T. Yamamoto, and H. Tajima
    "Electrical and magnetic properties of weak ferromagnetic organic conductor, τ-(EDO-S,S-DMEDT-TTF)2(AuBr2)1+y, (y～0.75) and it's analogs"
    Mol. Cryst. Liq. Cryst. 376, 171-176 (2002).

  22. T. Konoike, A. Oda, K. Ishikawa, T. Yamamoto, H. Tajima, H. Yoshino, K. Ueda, T. Sugimoto, K. Hiraki, T. Takahashi, T. Sasaki, Y. Nishio, K. Kajita, G. C. Papavassiliou, G. A. Mousdis, and K. Murata
    "Low temperature electronic nature of τ-phase conductors"
    Synth. Metals, 120, 801 (2001).

  23. T. Naito, T. Inabe, K. Takeda, K. Awaga, T. Akutagawa, T. Hasegawa, T. Nakamura, T. Takeuchi, H. Sawa, T. Yamamoto, and H. Tajima
    "β"-(ET)3(MnCl4)(1,1,2-C2H3Cl3) (ET=bis (ethylenedithio) tetrathiafulvalene);a pressure-sensitive new molecular conductor with localized spins"
    J. Mater. Chem., 11, 2221-2227 (2001).

  24. T. Yamamoto, N. Hanasaki, J. Yamaura, S. Aonuma, H. Tajima, K. Yakushi, M. Uruichi, and R. Kato
    "Phase diagrams of (DMe-DCNQI)2Li1-xCux system"
    Synth. Met., 120, 873-874 (2001).

  25. T. Kawamoto, T. Mori, T. Yamamoto, H. Tajima, Y. Misaki, and K. Tanaka
    "Marginal Paramagnetic State of a One-Dimensional Half-Filled Alternating Chain in (TTM-TTP)AuI2"
    J. Phys. Soc. Jpn., 69, 4066 (2000).

  26. T. Yamamoto, H. Tajima, and R. Kato
    "Magnetic Susceptibility of (DMe-DCNQI)2Li1-xCux"
    Solid State Commun., 114, 281-284 (2000).

  27. T. Yamamoto, H. Tajima, J. Yamaura, S. Aonuma, and R. Kato
    "Reflectance Spectra and Temperature Dependence of Electrical Resistivity of (Me2DCNQI)2Li1-xCux"
    J. Phys. Soc. Jpn., 68(4), 1384-1391 (1999).

  28. T. Kawamoto, M. Ashizawa, M. Aragaki, T. Mori, T. Yamamoto, H. Tajima, H. Kitagawa, T. Mitani, Y. Misaki, and K. Tanaka
    "Raman and Optical Investigations on Charge Localization in the One-dimensional Organic Conductors, (TTM-TTP)(I3)5/3 and (TSM-TTP)(I3)5/3"
    Phys. Rev. B., 60, 4635 (1999).

  29. H. Tajima, T. Yamamoto, J. Yamaura, S. Aonuma, and R. Kato
    "The Study of 4kF CDW in a one-dimensional system, (DMe-DCNQI)2Li1-xCux"
    Synth. Met., 103, 2193-2194 (1999).