Article Dans Une Revue Physical Review Letters Année : 1996

Two-Dimensional Vortex Melting in BEDT Organic Superconductors and NMR Relaxation Induced by Vortex Structure Defects

Résumé

We present experimental studies and a theoretical model of the 1H NMR relaxation rate (1yT1) in the BEDT organic superconductor in magnetic fields B perpendicular to the conducting layers. The curves T1−1 (T, B − const) show a pronounced peak, whose position Tm(B) coincides with a phase transition line as it has been revealed by other methods. The peak sharpens remarkably with decreasing B when the family of curves T1−1(T, B) converges to the field independent “master curve” below Tm. We show that the complex of experimental results cannot be interpreted as resulting from harmonic oscillations of a rigid vortex lattice, and suggest that the relaxation comes from the Brownian motion of highly diffusive point defects in decoupled 2D crystals of pancake vortices.

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hal-04944398 , version 1 (03-04-2025)

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H. Mayaffre, P. Wzietek, D. Jérome, S. Brazovskii. Two-Dimensional Vortex Melting in BEDT Organic Superconductors and NMR Relaxation Induced by Vortex Structure Defects. Physical Review Letters, 1996, 76 (26), pp.4951-4954. ⟨10.1103/PhysRevLett.76.4951⟩. ⟨hal-04944398⟩
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