Abstract
The plasticity of vortex crystals, their melting at the line T m(B) or the corresponding freezing of the vortex liquid are on agenda in current studies of layered superconductors. We review the NMR experiments and present a related theory which prove an unexpectedly large concentration of highly diffusive thermally activated defects: interstitials and vacancies below T m and indicate a presence of unbound 2D dislocations above T m . Also we interpret the critical 2D regime of freezing above T m . The picture is based on the analysis of the longitudinal relaxation rate W(T, B) of the 1 H NMR in the layered organic superconductor κ-BEDT with respect to a developed theory of the NMR relaxation by defects and critical fluctuations. The high magnitude of the peak in W at T m , its sharpening at lower fields B ~ 1 Tsl and especially the ≪master curve ≫ structure in the family of lines W(T, B = const) at the low T slope of the peak lead to above conclusions.
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