NMR study of the vortex slush phase in organic superconductor κ-(BEDT-TTF) 2 Cu(NCS) 2

M. Urano, J. Tonishi, H. Inoue, T. Saito, T. Fujiwara, H. Chiku, A. Oosawa, T. Goto, Takao Suzuki, T. Sasaki, N. Kobayashi, S. Awaji, K. Watanabe

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Abstract

The vortex state in a single crystal of the layered organic superconductor κ-(BEDT- TTF)2 Cu(NCS) 2, where BEDT-TTF (or ET) is bis(ethylenedithio) tetrathiafulvalene, was studied by H-NMR 1. Under a low field region around 0.75 T, the vortex-glass-liquid transition was demonstrated by a diverging of the longitudinal nuclear spin relaxation rate and peak broadening in spectra. Under a high field region near the upper critical field Hc2 (0)7 T, the curvature of nuclear spin relaxation curves showed a drastic change at the temperature where the emergence of the quantum vortex slush state was reported. The mechanism in this curvature change was discussed in terms of the fluctuating field produced by fragments of vortex glass.

Original languageEnglish
Article number024505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number2
DOIs
Publication statusPublished - 2007 Jul 11
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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