Superconducting State of κ-(ET)2CU[N(CN)2]Br Studied by C13 NMR: Evidence for Vortex-Core-Induced Nuclear Relaxation and Unconventional Pairing
H. Mayaffre, P. Wzietek, D. Jérome, C. Lenoir, P. Batail
DOI 10.1103/PhysRevLett.75.4122 · Physical Review Letters
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Abstract
We present the first C13 NMR measurements carried out in the superconducting state of a two-dimensional organic superconducting single crystal. Spin lattice relaxation rate and Knight shift are reported for magnetic fields parallel and perpendicular to the conducting layers. For perpendicular fields, the relaxation is dominated by the electronic excitations in the vortex cores. From the field dependence of (T1)−1 we obtain the upper critical field [Hc2(0)=10 T]. In parallel orientation, the absence of field dependence reveals the existence of a lock-in state, where only relaxation by superconducting excitations is expected. The (T1)−1 then exhibits a T3 law suggesting an unconventional pairing with a very anisotropic gap.
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 not reported | unknown |
| V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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