Electronic Phase Control of Molecular Systems Research Team

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Electronic Phase Control of Molecular Systems Research Team

Research Areas

Organic conductors have the following characteristics;
1) Clear electronic structure constructed by π-electrons
2) Low dimensional electronic systems can be easily obtained.
3) Sensitivity to external stimuli including pressure, light, magnetic field, electric field
4) Intramolecular degrees of freedom can be used for the control of electronic properties.
5) A variety of chemical modifications
Based on these characteristics, this team is trying to develop organic π-electron systems which exhibit unique and gigantic responses to external stimuli.

Team Leader
Reizo KATO (D.Sci.)

Research Subject

(1)	Molecular zero-gap conductors
(2)	Photo-induced phenomena of molecular materials
(3)	Charge ordering phenomena of molecular materials

List of Selected Publications

(1)	Tajima, N., Kato, R., and Taniguchi, H.: "Transport Properties of an Organic Mott Insulator β'-(BEDT-TTF)2ICl2." Europhys. Lett. 83, 27008/1-5 (2008).
(2)	Yamamoto, T., Yamamoto, H. M., Kato, R., Uruichi, M., Yakushi, K., Akutsu, H., Sato-Akutsu, A., Kawamoto, A., Turner, S.S., and Day, P.: "Inhomogeneous site charges at the boundary between the insulating, superconducting, and metallic phases of β"-type bis-ethylenedithio-tetrathiafulvalene molecular charge-transfer salts." Phys. Rev. B, 77, 205120/1-14 (2008).
(3)	Sugawara, S., Ueno, T., Tajima, N., Nishio, Y., and Kajita, K.: "Magnetoresistance of quasi two-dimensional organic conductors κ(BEDT-TSeF)2FeX4 (X=Cl, Br) and mapping of Fermi surface." J. Phys. Soc. Jpn., 76(11), 114706/1-7 (2007).
(4)	Tajima, N., Sugawara, S., Tamura, M., Kato, R., Nishio, Y., and Kajita, K.: "Transport properties of massless Dirac fermions in an organic conductor α-(BEDT-TTF)2I3 under pressure." Europhys. Lett. 80, 47002/1-5 (2007).
(5)	Yamamoto, T., Kato, R., Yamamoto, H. M., Fukaya, A., Yamasawa, K., Takahashi, I., Akutsu, H., Akutsu-Sato, A., and Day, P.: "Technique for anisotropic extension of organic crystals: Application to temperature dependence of electrical resistance." Rev. Sci. Instrum., 78, 083906/1-11 (2007).
(6)	Yamamoto, T., Eda, J., Nakao, A., Kato, R., and Yakushi, K.: "Charge ordered state and frustration of site charges in (ET)5Te2I6 and (BETS)5Te2I6." Phys. Rev. B, 75, 205132/1-18 (2007).
(7)	Fujisawa, J., Tajima, N., Tamaki, K., Shimomura, M., and Ishihara, T.: "Electronic Interactions between Inorganic Nanowires and Organic Electron Acceptors: Drastic Changes in Optical Response and Molecular Vibration." J. Phys. Chem. C, 111(3), 1146 -1149 (2007).
(8)	Jindo, R., Sugawara, S., Tajima, N., Yamamoto, H. M., Kato, R., Nishio, Y., and Kajita, K.: "Out-of-Plane Resistance of Quasi-Two Dimensional Metal (BEDT-TTF)3Cl(DFBIB) in Transverse Magnetic Fields." J. Phys. Soc. Jpn., 75(1), 013705/1-5 (2006).
(9)	Tajima, N., Sugawara, S., Tamura, M., Nishio, Y., and Kajita, K.: "Electronic Phases in an Organic Conductor α-(BEDT-TTF)2I3: Ultra Narrow Gap Semiconductor, Superconductor, Metal, and Charge-Ordered Insulator." J. Phys. Soc. Jpn. Special Issue "Organic Conductors", 75, 051010 (2006).
(10)	Tajima, N., Fujisawa, J-I., Naka, N., Ishihara, T., Kato, R., Nishio, Y., and Kajita, K.: "Photo-induced Insulator-Metal Transition in an Organic Cunductor ƒ¿-(BEDT-TTF)2I3." J. Phys. Soc. Jpn., 74, 511-514 (2005).

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