Infrared optical conductivity and the electronic phase diagram in the organic superconductor κ-(BEDT-TTF)2X

I. Ito; T. Sasaki; N. Yoneyama; N. Kobayashi; N. Hanasaki; H. Tajima; T. Ito; Y. Iwasa

doi:10.1016/j.asieco.2004.02.005

Infrared optical conductivity and the electronic phase diagram in the organic superconductor κ-(BEDT-TTF)₂X

I. Ito, T. Sasaki, N. Yoneyama, N. Kobayashi, N. Hanasaki, H. Tajima, T. Ito, Y. Iwasa

Institute for Materials Research (IMR) (institute affiliation only)

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

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*.

Original language	English
Pages (from-to)	321-322
Number of pages	2
Journal	Journal De Physique. IV : JP
Volume	114
DOIs	https://doi.org/10.1016/j.asieco.2004.02.005
Publication status	Published - 2004
Event	ISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France Duration: 2003 Sep 21 → 2003 Sep 26

Keywords

Electron-molecular vibration coupling
Optical conductivity
κ-(BEDT-TTF)Cu(NCS)

ASJC Scopus subject areas

Physics and Astronomy(all)

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@article{a7d74068fca543d69c723fd52399d021,

title = "Infrared optical conductivity and the electronic phase diagram in the organic superconductor κ-(BEDT-TTF)2X",

abstract = "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*.",

keywords = "Electron-molecular vibration coupling, Optical conductivity, κ-(BEDT-TTF)Cu(NCS)",

author = "I. Ito and T. Sasaki and N. Yoneyama and N. Kobayashi and N. Hanasaki and H. Tajima and T. Ito and Y. Iwasa",

note = "Copyright: Copyright 2008 Elsevier B.V., All rights reserved.; ISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets ; Conference date: 21-09-2003 Through 26-09-2003",

year = "2004",

doi = "10.1016/j.asieco.2004.02.005",

language = "English",

volume = "114",

pages = "321--322",

journal = "European Physical Journal: Special Topics",

issn = "1951-6355",

publisher = "Springer Verlag",

}

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.

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 -