2005/12/16 by S. Senoussi, S. Sénoussi, A. Tirbiyine +3
Materials Science · Physics and Astronomy · #Condensed matter physics #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.73.014525
17 pages; 4 figures
arxiv created 2005/12/16 · openalex publication_date 2006/01/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
It is known that some (BEDT\text\ensuremath-TTF)2X layered organic superconductors undergo a glassy transition near 80 K. Our purpose is to exploit quenched disorder to obtain insights on both the superconducting state (T\ensuremath\leqslant12\phantom\rule0.3em0exK) and the glassy transition by studying the superconducting properties as functions of annealing time (ta) and temperature (Ta) around 80 K. The main results on the fully deuterated \ensuremathκ\text\ensuremath-(BEDT\text\ensuremath-TTF)2Cu[N(CN)2]Br compound are as follows: (i) The data can be described by a percolation cluster model. (ii) At short time scales, the clusters grow with ta following a power law. (iii) At large time scales the clusters grow toward a thermodynamic state following a stretched exponential law \ensuremath∝1\ensuremath-exp[\ensuremath-(t∕\ensuremathτ)^\ensuremathβ] with \ensuremathβ varying from about 0.5 to 1 in our Ta range (65--110 K). (iv) The relaxation time follows an Arrhenius law \ensuremathτ(T)=\ensuremathτ0\phantom\rule0.3em0exexp(U∕T) with U\ensuremath≈2660\phantom\rule0.3em0exK and 1∕\ensuremathτ0\ensuremath≈2\ifmmode×\else\texttimes\fi1013\phantom\rule0.3em0exs^\ensuremath-1. (v) The asymptotic magnetization fits with a scaling law \ensuremath∝(Ta\ensuremath-Tg)^\ensuremath-n with Tg\ensuremath≈55\phantom\rule0.3em0exK and n\ensuremath≈3.2. The results are consistent with a Ising spin-glass-like model.