Field dependence of magnetization and magnetic relaxation in (Bi,Pb) sub 2 Sr sub 2 CaCu sub 2 O sub 8 crystals

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.10190· OSTI ID:5995297

Zhang, L; Liu, J Z; Lan, M D; Klavins, P; Shelton, R N ^[1]

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1. Department of Physics, University of California, Davis, California (USA)

The hysteresis loops and magnetic relaxation in (Bi,Pb){sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} crystals were measured at fields up to 5.5 T. The relaxation rate {ital dM}/{ital d} ln{ital t} exhibits a strong field dependence in the temperature range 6--20 K. By expanding Bean's model of the critical current density to include the field dependence of the flux-creep effect, we developed expressions for both {ital M} and {ital dM}/{ital d} ln{ital t} as a function of the field. These expressions were used to fit our experimental data of field-dependent magnetization and relaxation rate.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5995297
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:18; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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