The angular dependence of the irreversibility field of La{sub 2{minus}x}Sr{sub x}CuO{sub 4{minus}{delta}} single crystals

Journal Article · Tue Mar 01 04:00:00 EST 1994 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.312208· OSTI ID:40251

Bugoslavsky, Yu V ^[1]

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1. General Physics Inst., Moscow (Russian Federation)

The experimental study of La{sub 2{minus}x}Sr{sub x}CuO{sub 4{minus}{delta}} superconducting single crystals is reported. The magnetization measurements were carried out at T = 4.2 K in magnetic fields tilted by an arbitrary angle {theta} to the crystal c axis. The irreversibility field H{sub irr}, defined by extrapolation of pinning force curves, shows a strong dependence on {theta}. At 30{degree} < {theta} < 85{degree}, H{sub irr} scales as (cos {theta}){sup {minus}2/3}. At {theta} close to 90{degree}, the curve crosses over to a steeply decreasing dependence. It is proposed that in the field inclined with respect to the ab plane pinning is due to collective interaction of kinked vortices with c-axis-aligned crystalline defects. When vortices are parallel to the ab plane no kinks are present and pinning is weaker. Simple scaling considerations based on this assumption allow to explain the observed angular dependence and the crossover of the irreversibility field.

• OSTI ID: 40251
• Report Number(s): CONF-930860--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 2Pt2 Vol. 30; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
CRITICAL FIELD
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
MAGNETIC FLUX
PENETRATION DEPTH
STRONTIUM OXIDES
SUPERCONDUCTIVITY