Cooling rate dependence of the in-plane magnetic penetration depth in κ-type BEDT-TTF superconductors

N. Yoneyama, A. Higashihara, T. Sasaki, T. Nojima, N. Kobayashi

Research output: Contribution to journalConference articlepeer-review

Abstract

We performed dc magnetization measurements under the control of cooling-rate in the organic superconductors κ-(BEDT-TTF)2X (X=Cu(NCS)2 and Cu[N(CN)2]Br). A distinct different cooling-rate dependence of the in-plane magnetic penetration depth (λ//(0)) was observed between two salts, where λ//(0) was estimated from a linear extrapolation to 0 K. In the Cu(NCS)2 salt, λ//(0) remains unchanged regardless of cooling-rate, while Tc decreases slightly in faster-cooling. On the other hand,λ//(0) in the Cu[N(CN)2]Br salt becomes long significantly in faster-cooling. We quantitatively explain the change of λ//(0) in the cooling-rate as an impurity effect by terminal ethylene disorder in BEDT-TTF molecules in terms of the local and clean limit approximation.

Original languageEnglish
Pages (from-to)401-402
Number of pages2
JournalJournal De Physique. IV : JP
Volume114
DOIs
Publication statusPublished - 2004
EventISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France
Duration: 2003 Sep 212003 Sep 26

Keywords

  • London model
  • Magnetization
  • Organic superconductor
  • Penetration depth

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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