Two-Dimensional Vortex Melting in BEDT Organic Superconductors and NMR Relaxation Induced by Vortex Structure Defects
H. Mayaffre, P. Wzietek, D. Jérome, S. Brazovskii
DOI 10.1103/PhysRevLett.76.4951 · Physical Review Letters
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Abstract
We present experimental studies and a theoretical model of the 1H NMR relaxation rate ( 1/T1) 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (ET)2Cu(N(CN)2)Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (ET)2Cu(NCS)2 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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