Low-temperature increase of resistive critical fields in certain superconductors: A simple fluctuation approach

The resistive critical fields of several types of superconductor such as Tl[sub 2]Ba[sub 2]CuO[sub 6+[ital x]], [kappa]-(BEDT- TTF)[sub 2]Cu(NCS)[sub 2], and Ba[sub 1[minus][ital x]]K[sub [ital x]]BiO[sub 3] show an unusual increase at low temperatures. We argue that this arises from thermodynamic f...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1995-03, Vol.51 (9), p.6179-6182
Main Authors: Cooper, JR, Loram, JW, Wade, JM
Format: Article
Language:English
Subjects:
ALKALI METALS
ALKALINE EARTH METALS
BARIUM
BISMUTH
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
CRITICAL FIELD
ELEMENTS
FLUCTUATIONS
MAGNETIC FIELDS
METALS
ORGANIC COMPOUNDS
POTASSIUM
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THALLIUM
TRANSITION ELEMENTS
VARIATIONS 665410 > Superconductivity-- (1992-)
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Summary:The resistive critical fields of several types of superconductor such as Tl[sub 2]Ba[sub 2]CuO[sub 6+[ital x]], [kappa]-(BEDT- TTF)[sub 2]Cu(NCS)[sub 2], and Ba[sub 1[minus][ital x]]K[sub [ital x]]BiO[sub 3] 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 [ital U]([ital H],[ital T]) by a magnetic field. This effect should be significant for any material for which [ital U][Omega][approx lt][ital k][sub [ital BT]][sub [ital c]] at low temperatures and zero field, where [Omega] is the coherence volume, which probably includes most cuprate superconductors.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.51.6179