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NMR Study on the Vortex Slush Phase in Organic Superconductor kappa-(BEDT-TTF)2Cu(NCS)2

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arxiv 0705.4323 v2 pith:AEDC5WLU submitted 2007-05-30 cond-mat.str-el cond-mat.supr-con

NMR Study on the Vortex Slush Phase in Organic Superconductor kappa-(BEDT-TTF)2Cu(NCS)2

M. Urano , J. Tonishi , H. Inoue , T. Saito , T. Fujiwara , H. Chiku , A. Oosawa , T. Goto
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T. Suzuki T. Sasaki N. Kobayashi S. Awaji K. Watanabe
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classification cond-mat.str-el cond-mat.supr-con
keywords vortexfieldbedt-ttfchangecurvaturekappa-nuclearorganic
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The vortex state in a single crystal of the layered organic superconductor \kappa-(BEDT-TTF2Cu(NCS)2, where BEDT-TTF (or ET) is bis(ethylenedithio)tetrathiafulvalene, was studied by 1H-NMR. 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.

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