Dissipation near T{sub c} in a textured (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} silver-clad tape
- Department of Physics, National University of Singapore, 10 Lower Kent Ridge, (Singapore) 119260
The transport resistance R of a silver-clad Bi(2223) tape has been studied as a function of temperature T and magnetic field H in the case of the field applied parallel (H{parallel}ab) and perpendicular (H{parallel}c) to the tape plane in the region of temperature near T{sub c} (T/T{sub c}{gt}0.9) and low fields below 2000 G. As observed in the low-temperature and high-field region, the broadening of the resistive transition [T{sub c}(0){minus}T{sub c}(H)] follows a power-law variation of the field, i.e., [T{sub c}(0){minus}T{sub c}(H)]{proportional_to}H{sup q}, where q is about 1/2 from the experimental result. The R(T) curves at various fields show an Arrhenius behavior for both H{parallel}ab and H{parallel}c. However, the activation energy U derived from the slope of the Arrhenius plot is more than one order of magnitude larger than usually reported. We think this large deviation of the U value is from the assumption of temperature-independent U in the Arrhenius law and find that a reasonable U value can be obtained through an improved Arrhenius plot by considering the dissipation as induced by the thermally activated flux flow in the vortex-liquid state. The anisotropy both in magnetoresistance curves R(H) and the irreversibility line H{sub irr}(T) shows a scaling behavior as predicted by the effective-mass model, i.e., f{sup {parallel}c}(H)=f{sup {parallel}ab}({gamma}H), where f can be either R or T{sub irr}, {gamma} is the anisotropy factor. From the scaling, {gamma} is about 3.5. Such a small {gamma} value for present sample suggests that the dissipation for H{parallel}ab is dominated by the small-angle grain boundaries, as described in the railway-switch model. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544927
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermally activated dissipation in a long-term-annealed single crystal of Bi sub 2 Sr sub 2 CaCu sub 2 O sub x
Transport and magnetization currents in BSCCO/Ag tapes
Related Subjects
ANISOTROPY
BISMUTH OXIDES
CALCIUM OXIDES
CHARGED-PARTICLE TRANSPORT
COPPER OXIDES
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
LEAD OXIDES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETORESISTANCE
SILVER
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
VORTICES
X-RAY DIFFRACTION