NMR relaxation rate in the superconducting state of the organic conductor κ-(BEDT-TTF $)_{2}$ Cu[N(CN $)_{2}$ ]Br

1 July 1996

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 54 (1), 76-79
https://doi.org/10.1103/physrevb.54.76

Abstract

The

{}^{13}C

nuclear spin-lattice relaxation rate,

{}^{13}

T_{1}^{- 1}

, has been measured in the superconducting state of κ-(BEDT-TTF

)_{2}

Cu[N(CN

)_{2}

]Br in a field parallel to the conducting layers. The

{}^{13}

T_{1}^{- 1}

exhibits an abrupt decrease just below the transition temperature without any indication of the Hebel-Slichter coherence peak. By separation of the vortex-dynamics contribution to

{}^{13}

T_{1}^{- 1}

with the use of

{}^{1}{NMR}

, the quasiparticle contribution to

{}^{13}

T_{1}^{- 1}

is found to follow a

T^{3}

law that is consistent with unconventional superconductivity with line nodes in gap parameter on the Fermi surface or highly anisotropic superconductivity. © 1996 The American Physical Society.

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NMR relaxation rate in the superconducting state of the organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

Abstract

NMR relaxation rate in the superconducting state of the organic conductor κ-(BEDT-TTF $)_{2}$ Cu[N(CN $)_{2}$ ]Br