C13 NMR studies of the normal and superconducting states of the organic superconductor κ-(ET)2Cu[N(CN)2]Br

S. M. De Soto; C. P. Slichter; A. M. Kini; H. H. Wang; U. Geiser; J. M. Williams

doi:10.1103/PhysRevB.52.10364

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C13 NMR studies of the normal and superconducting states of the organic superconductor κ-(ET)2Cu[N(CN)2]Br

S. M. De Soto, C. P. Slichter, A. M. Kini, H. H. Wang, U. Geiser, J. M. Williams

DOI 10.1103/PhysRevB.52.10364 · Physical Review B

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Abstract

The authors report C13 NMR spin-lattice relaxation rates 1/T1 and Knight shifts KS in the quasi-two-dimensional organic superconductor κ-(ET)2Cu[N(CN)2]Br (Tc=11.6 K), for an aligned single crystal. The normal-state behavior is reminiscent of the high-Tc cuprates, in which antiferromagnetic fluctuations and spin-gap behavior dominate. In the superconducting state, the data rule out the BCS electron-phonon mechanism as the source of the superconductivity, but support an unconventional pairing state with possible nodes in the gap function.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.6	Pressure unresolved	unknown
κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.6	Pressure unresolved	unknown
κ-(ET)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	unknown