Specific heat of organic superconductor λ-(BEDT-TSF)2GaCl4

Y. Ishizaki; H. Uozaki; H. Tsuchiya; Y. Abe; E. Negishi; H. Matsui; S. Endo; N. Toyota

doi:10.1016/S0379-6779(02)00258-8

Specific heat of organic superconductor λ-(BEDT-TSF)₂GaCl₄

Y. Ishizaki, H. Uozaki, H. Tsuchiya, Y. Abe, E. Negishi, H. Matsui, S. Endo, N. Toyota

SCI - Physics

Tohoku University

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

14 Citations (Scopus)

Abstract

We have measured the specific heat of λ-(BEDT-TSF)₂GaCl₄ by a thermal relaxation method below 7 K to study the superconducting state. The specific heat jump due to the superconducting transition at T_c = 4.8 K is observed. For the normal state, we have determined the electronic specific heat coefficient γ = 14.4 ± 3.4 mJ/molK² and the Debye temperature of Θ_D = 194.0 ± 0.4 K. The discontinuity of the specific heat is evaluated to be ΔC/γT_c = 1.37 ± 0.32, which coincides with a Bardeen-Cooper-Schrieffer (BCS) relation ΔC/γT_c = 1.43 for a weak-coupling limit. The zero-crossing (ΔC = 0) occurs at 0.67 T_c, which has been similarly observed in BEDT-TTF-based superconductors.

Original language	English
Pages (from-to)	219-220
Number of pages	2
Journal	Synthetic Metals
Volume	133-134
DOIs	https://doi.org/10.1016/S0379-6779(02)00258-8
Publication status	Published - 2003 Mar 13
Event	ISCOM 2001 - Rusutsu, Hokkaido, Japan Duration: 2001 Sept 10 → 2001 Sept 14

Keywords

Specific heat
Superconductor
Weak-couplin g superconductivity
λ-(BEDT-TSF)GaCl

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10.1016/S0379-6779(02)00258-8

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title = "Specific heat of organic superconductor λ-(BEDT-TSF)2GaCl4",

abstract = "We have measured the specific heat of λ-(BEDT-TSF)2GaCl4 by a thermal relaxation method below 7 K to study the superconducting state. The specific heat jump due to the superconducting transition at Tc = 4.8 K is observed. For the normal state, we have determined the electronic specific heat coefficient γ = 14.4 ± 3.4 mJ/molK2 and the Debye temperature of ΘD = 194.0 ± 0.4 K. The discontinuity of the specific heat is evaluated to be ΔC/γTc = 1.37 ± 0.32, which coincides with a Bardeen-Cooper-Schrieffer (BCS) relation ΔC/γTc = 1.43 for a weak-coupling limit. The zero-crossing (ΔC = 0) occurs at 0.67 Tc, which has been similarly observed in BEDT-TTF-based superconductors.",

keywords = "Specific heat, Superconductor, Weak-couplin g superconductivity, λ-(BEDT-TSF)GaCl",

author = "Y. Ishizaki and H. Uozaki and H. Tsuchiya and Y. Abe and E. Negishi and H. Matsui and S. Endo and N. Toyota",

year = "2003",

month = mar,

day = "13",

doi = "10.1016/S0379-6779(02)00258-8",

language = "English",

volume = "133-134",

pages = "219--220",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier BV",

note = "ISCOM 2001 ; Conference date: 10-09-2001 Through 14-09-2001",

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TY - JOUR

T1 - Specific heat of organic superconductor λ-(BEDT-TSF)2GaCl4

AU - Ishizaki, Y.

AU - Uozaki, H.

AU - Tsuchiya, H.

AU - Abe, Y.

AU - Negishi, E.

AU - Matsui, H.

AU - Endo, S.

AU - Toyota, N.

PY - 2003/3/13

Y1 - 2003/3/13

N2 - We have measured the specific heat of λ-(BEDT-TSF)2GaCl4 by a thermal relaxation method below 7 K to study the superconducting state. The specific heat jump due to the superconducting transition at Tc = 4.8 K is observed. For the normal state, we have determined the electronic specific heat coefficient γ = 14.4 ± 3.4 mJ/molK2 and the Debye temperature of ΘD = 194.0 ± 0.4 K. The discontinuity of the specific heat is evaluated to be ΔC/γTc = 1.37 ± 0.32, which coincides with a Bardeen-Cooper-Schrieffer (BCS) relation ΔC/γTc = 1.43 for a weak-coupling limit. The zero-crossing (ΔC = 0) occurs at 0.67 Tc, which has been similarly observed in BEDT-TTF-based superconductors.

AB - We have measured the specific heat of λ-(BEDT-TSF)2GaCl4 by a thermal relaxation method below 7 K to study the superconducting state. The specific heat jump due to the superconducting transition at Tc = 4.8 K is observed. For the normal state, we have determined the electronic specific heat coefficient γ = 14.4 ± 3.4 mJ/molK2 and the Debye temperature of ΘD = 194.0 ± 0.4 K. The discontinuity of the specific heat is evaluated to be ΔC/γTc = 1.37 ± 0.32, which coincides with a Bardeen-Cooper-Schrieffer (BCS) relation ΔC/γTc = 1.43 for a weak-coupling limit. The zero-crossing (ΔC = 0) occurs at 0.67 Tc, which has been similarly observed in BEDT-TTF-based superconductors.

KW - Specific heat

KW - Superconductor

KW - Weak-couplin g superconductivity

KW - λ-(BEDT-TSF)GaCl

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U2 - 10.1016/S0379-6779(02)00258-8

DO - 10.1016/S0379-6779(02)00258-8

M3 - Conference article

AN - SCOPUS:17144466759

SN - 0379-6779

VL - 133-134

SP - 219

EP - 220

JO - Synthetic Metals

JF - Synthetic Metals

T2 - ISCOM 2001

Y2 - 10 September 2001 through 14 September 2001

ER -

Specific heat of organic superconductor λ-(BEDT-TSF)₂GaCl₄

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Keywords

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