NMR evidence for a metastable vortex arrangement in the two-dimensional organic superconductor κ-(BEDT−TTF)2Cu(NCS)2
A. Van-Quynh, C. Berthier, H. Mayaffre, P. Ségransan, P. Batail
DOI 10.1103/PhysRevB.59.12064 · Physical Review B
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Abstract
A metastable state of the vortex lattice in the two-dimensional (2D) organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 has been attested by 1H NMR measurements. This metastable state, which could contain a substantial amount of vortex vacancies, is shown to be produced by the radiofrequency pulses used to detect the NMR signal. The creation of this metastable state is favored at the particular field Hmax=0.8 T, which is proposed as being the 3D-2D crossover field in this compound. From the temperature dependence of the anomalous line shapes generated by this metastable state, we deduce a temperature dependence of the in-plane magnetic penetration depth λab between 0.14 and 0.4Tc consistent with an anisotropic superconducting gap, probably with lines of nodes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
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