Comparative study of pinning and creep in Tl[sub 2]Ba[sub 2]CaCu[sub 2]O[sub 8] and Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] single crystals

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.10575· OSTI ID:5945545

Oussena, M; Porter, S; Volkozub, A V; de Groot, P A.J.; Lanchester, P C ^[1]; Ogborne, D; Weller, M T ^[2]; Balakrishnan, G; Paul, D M ^[3]

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1. Physics Department, University of Southampton, Southampton SO9 5NH (United Kingdom)
2. Chemistry Department, University of Southampton, Southampton SO9 5NH (United Kingdom)
3. Physics Department, University of Warwick, Coventry CV4 7AL (United Kingdom)

We have compared the pinning and creep in two identically shaped single crystals, Tl[sub 2]Ba[sub 2]CaCu[sub 2]O[sub 8] (Tl 2:2:1:2) and Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] (Bi 2:2:1:2) using magnetometry. The critical current density, [ital J][sub [ital c]], deduced from the [ital M]-[ital H] hysteresis loops is found to be the highest in Bi 2:2:1:2 at low temperatures ([ital T][lt]10 K). The field dependence of [ital J][sub [ital c]], in this temperature range, is similar for both crystals. At higher temperatures, [ital J][sub [ital c]] is found to decrease more rapidly with magnetic field in Bi 2:2:1:2 than in Tl 2:2:1:2. The critical current also decreases more quickly with temperature in Bi 2:2:1:2 leading to a vanishing [ital J][sub [ital c]] at temperatures lower than in the case of Tl 2:2:1:2. [ital I]-[ital V] characteristic curves have been obtained from measurements of magnetic-sweep-rate dependencies of the hysteresis loops. We have found that the characteristic temperature at which flux motion becomes important is significantly higher in Tl 2:2:1:2 than in Bi 2:2:1:2.

• OSTI ID: 5945545
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:14; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
FLUID FLOW
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
OXIDES
OXYGEN COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VORTEX FLOW