Abstract
A metastable state of the vortex lattice in the two-dimensional (2D) organic superconductor $\ensuremath{\kappa}$-$(\mathrm{BEDT}$-$\mathrm{TTF}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ has been attested by ${}^{1}\mathrm{H}$ 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 ${H}_{\mathrm{max}}=0.8$ 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 ${\ensuremath{\lambda}}_{\mathrm{ab}}$ between 0.14 and 0.4${T}_{c}$ consistent with an anisotropic superconducting gap, probably with lines of nodes.
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