NMR study of the vortex slush phase in organic superconductor κ−(BEDT−TTF)2Cu(NCS)2
M. Urano, J. Tonishi, H. Inoue, T. Saito, T. Fujiwara, H. Chiku, A. Oosawa, T. Goto, T. Suzuki, T. Sasaki, N. Kobayashi, S. Awaji, K. Watanabe
DOI 10.1103/PhysRevB.76.024505 · Physical Review B
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Abstract
The vortex state in a single crystal of the layered organic superconductor κ−(BEDT−TTF)2Cu(NCS)2, where BEDT-TTF (or ET) is bis(ethylenedithio)tetrathiafulvalene, was studied by H−NMR1. Under a low field region around 0.75T, 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)≃7T, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
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