2003/11/13 by N. Yoneyama, A. Higashihara, T. Sasaki +4
Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.73.1290
published as J. Phys. Soc. Jpn., 73 (2004) 1290-1296. · 8 pages, 9 figures
arxiv created 2003/11/13 · openalex publication_date 2004/05/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the in-plane penetration depth λ∥ of single crystals κ-(BEDT-TTF)2X (X= Cu(NCS)2 and Cu[N(CN)2]Br) by means of the reversible magnetization measurements under the control of cooling-rate. In X = Cu(NCS)2, λ∥(0) as an extrapolation toward T = 0 K does not change by the cooling-rate within the experimental accuracy, while T_\textrmc is slightly reduced. On the other hand, in X = Cu[N(CN)2]Br, λ∥(0) indicates a distinct increase by cooling faster. The different behavior of λ∥(0) on cooling-rate between the two salts is quantitatively explained in terms of the local-clean approximation (London model), considering that the former salt belongs to the very clean system and the later the moderate clean one. The good agreement with this model demonstrates that disorders of ethylene-group in BEDT-TTF introduced by cooling faster increase the electron(quasiparticle)-scattering, resulting in shorter mean free path.