Vortex-pair nucleation at defects: A mechanism for anomalous temperature dependence in the superconducting screening length
A. F. Hebard, A. T. Fiory, M. P. Siegal, Julia M. Phillips, R. C. Haddon
DOI 10.1103/PhysRevB.44.9753 · Physical Review B
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Abstract
Low-field ac screening measurements on YBa2Cu3O7−δ films and (BEDT-TTF)2Cu(SCN)2 crystals [where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene], both thought to contain a high density of defects, reveal a diminution of screening and a common extrinsic temperature dependence of the screening length λ. Vortex-core pinning at the defects is shown to give a low-temperature T2 power-law temperature dependence to λ that, in contrast to the exponential behavior expected from s-wave pairing, can be mistaken as evidence for lines or nodes of the energy gap on the Fermi surface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
| (BEDT-TTF)2Cu(SCN)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure not reported | unknown |
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