Low-temperature increase of resistive critical fields in certain superconductors: A simple fluctuation approach
J. R. Cooper, J. W. Loram, J. M. Wade
DOI 10.1103/PhysRevB.51.6179 · Physical Review B
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Abstract
The resistive critical fields of several types of superconductor such as Tl2Ba2CuO6+x, κ-(BEDT- TTF)2Cu(NCS)2, and Ba1−xKxBiO3 show an unusual increase at low temperatures. We argue that this arises from thermodynamic fluctuations which are strongly enhanced because of the reduction in condensation energy density U(H,T) by a magnetic field. This effect should be significant for any material for which UΩ≲kBTc at low temperatures and zero field, where Ω is the coherence volume, which probably includes most cuprate superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CuO6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.5 | Pressure not reported | unknown |
| Tl2Ba2CuO6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21.5 | Pressure not reported | unknown |
| Bi2Sr2CuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | unknown |
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.7 | Pressure not reported | unknown |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
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