TY - JOUR
T1 - Infrared optical conductivity and the electronic phase diagram in the organic superconductor κ-(BEDT-TTF)2X
AU - Ito, I.
AU - Sasaki, T.
AU - Yoneyama, N.
AU - Kobayashi, N.
AU - Hanasaki, N.
AU - Tajima, H.
AU - Ito, T.
AU - Iwasa, Y.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004
Y1 - 2004
N2 - The polarized optical reflectance spectra of κ-(BEDT-TTF) 2Cu(NCS)2 and its deuterated one are measured in the infrared region. Both the specific molecular vibration mode v3(a g) of the BEDT-TTF molecule and the optical conductivity hump in the mid-infrared region change correlatively at T*=45-50K. The results suggest that the electron-molecular vibration coupling on the v3(a g) mode becomes weak due to the enhancement of the itinerant nature of the carriers on the BEDT-TTF dimers below T*. The present observations demonstrate that two different metallic states are regarded as a correlated good metal below T* and a half filling bad metal above T*.
AB - The polarized optical reflectance spectra of κ-(BEDT-TTF) 2Cu(NCS)2 and its deuterated one are measured in the infrared region. Both the specific molecular vibration mode v3(a g) of the BEDT-TTF molecule and the optical conductivity hump in the mid-infrared region change correlatively at T*=45-50K. The results suggest that the electron-molecular vibration coupling on the v3(a g) mode becomes weak due to the enhancement of the itinerant nature of the carriers on the BEDT-TTF dimers below T*. The present observations demonstrate that two different metallic states are regarded as a correlated good metal below T* and a half filling bad metal above T*.
KW - Electron-molecular vibration coupling
KW - Optical conductivity
KW - κ-(BEDT-TTF)Cu(NCS)
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U2 - 10.1016/j.asieco.2004.02.005
DO - 10.1016/j.asieco.2004.02.005
M3 - Conference article
AN - SCOPUS:33645162855
VL - 114
SP - 321
EP - 322
JO - European Physical Journal: Special Topics
JF - European Physical Journal: Special Topics
SN - 1951-6355
T2 - ISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets
Y2 - 21 September 2003 through 26 September 2003
ER -