Substitution effect by deuterated donors on superconductivity in κ-(BEDT-TTF)2Cu[N(CN)2]Br

Naoki Yoneyama; Takahiko Sasaki; Norio Kobayashi

doi:10.1143/JPSJ.73.1434

Substitution effect by deuterated donors on superconductivity in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br

Naoki Yoneyama, Takahiko Sasaki, Norio Kobayashi

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

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

28 Citations (Scopus)

Abstract

We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system κ-[(h8-BEDT-TTF)_1-x(d8-BEDT-TTF) _x]₂Cu[N(CN)₂]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide-range (x = 0-1) substitution can accurately control chemical pressure near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, an increase in T_c observed up to x ∼ 0.1 is evidently caused by the chemical pressure effect. Neither a reduction of T _c nor a suppression of superconducting volume fraction is found below x ∼ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase in x, both T_c and superconducting volume fraction start to decrease toward values at x = 1.

Original language	English
Pages (from-to)	1434-1437
Number of pages	4
Journal	journal of the physical society of japan
Volume	73
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.73.1434
Publication status	Published - 2004 Jun

Keywords

Chemical pressure
Cooling rate
Deuterium substitution
Mott transition
Organic superconductor

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Substitution effect by deuterated donors on superconductivity in κ-(BEDT-TTF)2Cu[N(CN)2]Br",

abstract = "We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system κ-[(h8-BEDT-TTF)1-x(d8-BEDT-TTF) x]2Cu[N(CN)2]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide-range (x = 0-1) substitution can accurately control chemical pressure near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, an increase in Tc observed up to x ∼ 0.1 is evidently caused by the chemical pressure effect. Neither a reduction of T c nor a suppression of superconducting volume fraction is found below x ∼ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase in x, both Tc and superconducting volume fraction start to decrease toward values at x = 1.",

keywords = "Chemical pressure, Cooling rate, Deuterium substitution, Mott transition, Organic superconductor",

author = "Naoki Yoneyama and Takahiko Sasaki and Norio Kobayashi",

year = "2004",

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T1 - Substitution effect by deuterated donors on superconductivity in κ-(BEDT-TTF)2Cu[N(CN)2]Br

AU - Yoneyama, Naoki

AU - Sasaki, Takahiko

AU - Kobayashi, Norio

PY - 2004/6

Y1 - 2004/6

N2 - We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system κ-[(h8-BEDT-TTF)1-x(d8-BEDT-TTF) x]2Cu[N(CN)2]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide-range (x = 0-1) substitution can accurately control chemical pressure near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, an increase in Tc observed up to x ∼ 0.1 is evidently caused by the chemical pressure effect. Neither a reduction of T c nor a suppression of superconducting volume fraction is found below x ∼ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase in x, both Tc and superconducting volume fraction start to decrease toward values at x = 1.

AB - We investigate the superconductivity in the deuterated BEDT-TTF molecular substitution system κ-[(h8-BEDT-TTF)1-x(d8-BEDT-TTF) x]2Cu[N(CN)2]Br, where h8 and d8 denote fully hydrogenated and deuterated molecules, respectively. Systematic and wide-range (x = 0-1) substitution can accurately control chemical pressure near the Mott boundary, which results in the modification of the superconductivity. After cooling slowly, an increase in Tc observed up to x ∼ 0.1 is evidently caused by the chemical pressure effect. Neither a reduction of T c nor a suppression of superconducting volume fraction is found below x ∼ 0.5. This demonstrates that the effect of disorder by substitution is negligible in the present system. With further increase in x, both Tc and superconducting volume fraction start to decrease toward values at x = 1.

KW - Chemical pressure

KW - Cooling rate

KW - Deuterium substitution

KW - Mott transition

KW - Organic superconductor

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