Scaling behavior of the rf vortex penetration depth in an organic superconductor
S. Sridhar, B. Maheswaran, Balam A. Willemsen, Dong Ho Wu, R. C. Haddon
DOI 10.1103/PhysRevLett.68.2220 · Physical Review Letters
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Abstract
The radiofrequency penetration depth λ(H,T) of the organic superconductor (BEDT-TTF)2Cu(NCS)2 was studied in the mixed state at moderate fields. The data can be scaled into a single functional form Δλ(H,T)=Δλ*(T)f(H/H*(T)), where H*(T)×(1-t)3/2/t can be identified with a ‘‘depinning’’ or ‘‘irreversibility’’ line. We show that the scaling features are contained in a theory of vortex motion in a periodic pootential under the influence of thermal fluctuations, which describes the functional form quantitatively. The data for Δλ(H=0, T) are governed by the same (vortex) length scale as the finite-field data, suggesting that the zero-field state is not a conventional Meissner state obeying a London relation.
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. | 9.9 | Pressure not reported | onset |
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