Flux dynamics in a single crystal of Bi sub 2 Sr sub 2 CaCu sub 2 O sub x

Conference · Sun Mar 31 23:00:00 EST 1991

OSTI ID:5553964

Shi, Donglu ^[1]; Ling, X S; Budnick, J I ^[2]

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1. Argonne National Lab., IL (USA)
2. Connecticut Univ., Storrs, CT (USA). Dept. of Physics

We report on a systemmatic study of the long-time decay of the irreversible magnetization of a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} single crystal. The decay of magnetization cannot be well described by the Anderson-Kim flux creep model. We interpret the magnetic relaxation data with the self-organized criticality theory. In contrast to the flux creep models in which only uncorrelated, individual flux hoppings occur, SOC theory describes a spatially and temporally correlated dynamics. The time dependence of magnetization can best be characterized by a stretched exponential, exp({minus}(t/t{sub 0}){sup n}) (0 < n < 1), or Kohlrausch's law. We argue that the dynamics of flux creep in Bean's critical state is governed by an avalanche-like dynamics of SOC theory. 13 refs., 2 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5553964
• Report Number(s): ANL/CP-73203; CONF-9105151--3; ON: DE91013763
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
HIGH-TC SUPERCONDUCTORS
MAGNETIZATION
OXIDES
OXYGEN COMPOUNDS
RELAXATION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS