Impurity effect on superconducting properties in molecular substituted organic superconductor κ-(ET) 2Cu(NCS) 2

Naoki Yoneyama; Takahiko Sasaki; Hajime Oizumi; Norio Kobayashi

doi:10.1143/JPSJ.76.123705

Impurity effect on superconducting properties in molecular substituted organic superconductor κ-(ET) ₂Cu(NCS) ₂

Naoki Yoneyama, Takahiko Sasaki, Hajime Oizumi, Norio Kobayashi

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

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

6 Citations (Scopus)

Abstract

We report an impurity effect in the organic superconductor κ-(ET) ₂Cu(NCS) ₂ by substitution of the ET molecule with an analogue, bis(methylenedithio)tetrathiafulvalene (MT). The superconducting transition temperature decreases with increasing substitution. The in-plane magnetic penetration depth is enhanced with substitution, which is quantitatively attributed to the decrease in the in-plane mean free path. The enhancement of the penetration depth can also explain the reduction of the effective pinning in terms of the condensation energy.

Original language	English
Article number	123705
Journal	journal of the physical society of japan
Volume	76
Issue number	12
DOIs	https://doi.org/10.1143/JPSJ.76.123705
Publication status	Published - 2007 Dec

Keywords

Impurity
Magnetization
Mean free path
Molecular substitution
Organic superconductor
Penetration depth

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.123705

Cite this

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title = "Impurity effect on superconducting properties in molecular substituted organic superconductor κ-(ET) 2Cu(NCS) 2 ",

abstract = "We report an impurity effect in the organic superconductor κ-(ET) 2Cu(NCS) 2 by substitution of the ET molecule with an analogue, bis(methylenedithio)tetrathiafulvalene (MT). The superconducting transition temperature decreases with increasing substitution. The in-plane magnetic penetration depth is enhanced with substitution, which is quantitatively attributed to the decrease in the in-plane mean free path. The enhancement of the penetration depth can also explain the reduction of the effective pinning in terms of the condensation energy.",

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T1 - Impurity effect on superconducting properties in molecular substituted organic superconductor κ-(ET) 2Cu(NCS) 2

AU - Yoneyama, Naoki

AU - Sasaki, Takahiko

AU - Oizumi, Hajime

AU - Kobayashi, Norio

PY - 2007/12

Y1 - 2007/12

N2 - We report an impurity effect in the organic superconductor κ-(ET) 2Cu(NCS) 2 by substitution of the ET molecule with an analogue, bis(methylenedithio)tetrathiafulvalene (MT). The superconducting transition temperature decreases with increasing substitution. The in-plane magnetic penetration depth is enhanced with substitution, which is quantitatively attributed to the decrease in the in-plane mean free path. The enhancement of the penetration depth can also explain the reduction of the effective pinning in terms of the condensation energy.

AB - We report an impurity effect in the organic superconductor κ-(ET) 2Cu(NCS) 2 by substitution of the ET molecule with an analogue, bis(methylenedithio)tetrathiafulvalene (MT). The superconducting transition temperature decreases with increasing substitution. The in-plane magnetic penetration depth is enhanced with substitution, which is quantitatively attributed to the decrease in the in-plane mean free path. The enhancement of the penetration depth can also explain the reduction of the effective pinning in terms of the condensation energy.

KW - Impurity

KW - Magnetization

KW - Mean free path

KW - Molecular substitution

KW - Organic superconductor

KW - Penetration depth

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