Infrared studies of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 under pressure

A. K. Klehe; R. D. McDonald; A. F. Goncharov; V. V. Struzhkin; Ho Kwang Mao; R. J. Hemley; T. Sasaki; W. Hayes; J. Singleton

doi:10.1088/0953-8984/12/13/103

Infrared studies of the organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂ under pressure

A. K. Klehe, R. D. McDonald, A. F. Goncharov, V. V. Struzhkin, Ho Kwang Mao, R. J. Hemley, T. Sasaki, W. Hayes, J. Singleton

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

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

The organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂ has been investigated at room temperature by polarized mid-infrared (600-7000 cm^-1) reflectivity measurements at pressures of up to 1.7 GPa. The optical effective mass, m_opt, decreases linearly with pressure, in contrast to the pressure dependence of the effective mass, m*, determined by magnetic quantum oscillation measurements (Caulfield J et al 1994 J. Phys.:Condens. Matter 6 2911-24; Caulfield J et al 1995 Synth. Met. 70 815-8). Most phonon modes are seen to exhibit a linear pressure dependence of 0.5-1%/GPa. The stronger pressure dependence of the central C=C mode of the BEDT-TTF molecule is discussed: it is thought to be due to the pressure dependence of the effective Coulomb repulsion in κ-(BEDT-TTF)₂Cu(SCN)₂. These measurements suggest that a change in the electron-electron interaction under pressure could be the relevant factor for the suppression of superconductivity under pressure in κ-(BEDT-TTF)₂Cu(SCN)₂.

Original language	English
Pages (from-to)	L247-L256
Journal	Journal of Physics Condensed Matter
Volume	12
Issue number	13
DOIs	https://doi.org/10.1088/0953-8984/12/13/103
Publication status	Published - 2000 Apr 3

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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Infrared studies of the organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂ under pressure. / Klehe, A. K.; McDonald, R. D.; Goncharov, A. F.; Struzhkin, V. V.; Mao, Ho Kwang; Hemley, R. J.; Sasaki, T.; Hayes, W.; Singleton, J.

In: Journal of Physics Condensed Matter, Vol. 12, No. 13, 03.04.2000, p. L247-L256.

Research output: Contribution to journal › Article › peer-review

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title = "Infrared studies of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 under pressure",

abstract = "The organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 has been investigated at room temperature by polarized mid-infrared (600-7000 cm-1) reflectivity measurements at pressures of up to 1.7 GPa. The optical effective mass, mopt, decreases linearly with pressure, in contrast to the pressure dependence of the effective mass, m*, determined by magnetic quantum oscillation measurements (Caulfield J et al 1994 J. Phys.:Condens. Matter 6 2911-24; Caulfield J et al 1995 Synth. Met. 70 815-8). Most phonon modes are seen to exhibit a linear pressure dependence of 0.5-1%/GPa. The stronger pressure dependence of the central C=C mode of the BEDT-TTF molecule is discussed: it is thought to be due to the pressure dependence of the effective Coulomb repulsion in κ-(BEDT-TTF)2Cu(SCN)2. These measurements suggest that a change in the electron-electron interaction under pressure could be the relevant factor for the suppression of superconductivity under pressure in κ-(BEDT-TTF)2Cu(SCN)2.",

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AU - Klehe, A. K.

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AU - Struzhkin, V. V.

AU - Mao, Ho Kwang

AU - Hemley, R. J.

AU - Sasaki, T.

AU - Hayes, W.

AU - Singleton, J.

PY - 2000/4/3

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N2 - The organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 has been investigated at room temperature by polarized mid-infrared (600-7000 cm-1) reflectivity measurements at pressures of up to 1.7 GPa. The optical effective mass, mopt, decreases linearly with pressure, in contrast to the pressure dependence of the effective mass, m*, determined by magnetic quantum oscillation measurements (Caulfield J et al 1994 J. Phys.:Condens. Matter 6 2911-24; Caulfield J et al 1995 Synth. Met. 70 815-8). Most phonon modes are seen to exhibit a linear pressure dependence of 0.5-1%/GPa. The stronger pressure dependence of the central C=C mode of the BEDT-TTF molecule is discussed: it is thought to be due to the pressure dependence of the effective Coulomb repulsion in κ-(BEDT-TTF)2Cu(SCN)2. These measurements suggest that a change in the electron-electron interaction under pressure could be the relevant factor for the suppression of superconductivity under pressure in κ-(BEDT-TTF)2Cu(SCN)2.

AB - The organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 has been investigated at room temperature by polarized mid-infrared (600-7000 cm-1) reflectivity measurements at pressures of up to 1.7 GPa. The optical effective mass, mopt, decreases linearly with pressure, in contrast to the pressure dependence of the effective mass, m*, determined by magnetic quantum oscillation measurements (Caulfield J et al 1994 J. Phys.:Condens. Matter 6 2911-24; Caulfield J et al 1995 Synth. Met. 70 815-8). Most phonon modes are seen to exhibit a linear pressure dependence of 0.5-1%/GPa. The stronger pressure dependence of the central C=C mode of the BEDT-TTF molecule is discussed: it is thought to be due to the pressure dependence of the effective Coulomb repulsion in κ-(BEDT-TTF)2Cu(SCN)2. These measurements suggest that a change in the electron-electron interaction under pressure could be the relevant factor for the suppression of superconductivity under pressure in κ-(BEDT-TTF)2Cu(SCN)2.

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