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; T. Suzuki; T. Sasaki; N. Kobayashi; S. Awaji; K. Watanabe

doi:10.1103/PhysRevB.76.024505

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

Strongly Correlated Electrons 2009-11-13 v2 Superconductivity

Authors: 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

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

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.

Keywords

organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2 vortex slush vortex glass-liquid transition NMR nuclear spin relaxation upper critical field

Cite

@article{arxiv.0705.4323,
  title  = {NMR Study on the Vortex Slush Phase in Organic Superconductor \kappa-(BEDT-TTF)2Cu(NCS)2},
  author = {M. Urano and J. Tonishi and H. Inoue and T. Saito and T. Fujiwara and H. Chiku and A. Oosawa and T. Goto and T. Suzuki and T. Sasaki and N. Kobayashi and S. Awaji and K. Watanabe},
  journal= {arXiv preprint arXiv:0705.4323},
  year   = {2009}
}

Comments

5 pages, 4 figures

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

Abstract

Keywords

Cite

Comments

Related papers