Hysteretical temperature dependence of AC susceptibility in granular high-Tc superconductors

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The AC susceptibility, χAC(T), with superimposed DC magnetic field, HDSa, has been measured as a function of temperature in bulk sintered LaSrCuO, for zero-field cooled (ZFC) and field-cooled (FC) samples. Results are analyzed within Kim's critical-state model extended to a granular superconduc...

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Detalles Bibliográficos
Autores principales: Bekeris, V., Ferrari, H., Acha, C., Levy, P., Polla, G., Leyva, G.
Formato: JOUR
Materias:
Calculations
High temperature superconductors
Hysteresis
Magnetic fields
Magnetic permeability
Magnetic variables measurement
Sintering
Thermal effects
AC susceptibility
Effective intergranular local field
Field cooled material
Field independent integranular critical state parameter
Granular superconductor
Hysteretical temperature dependence
Kims critical state model
Temperature dependent effective permeability
Zero field cooled material
Oxide superconductors
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09214534_v234_n1-2_p49_Bekeris
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The AC susceptibility, χAC(T), with superimposed DC magnetic field, HDSa, has been measured as a function of temperature in bulk sintered LaSrCuO, for zero-field cooled (ZFC) and field-cooled (FC) samples. Results are analyzed within Kim's critical-state model extended to a granular superconductor, where the role of grains is to determine the temperature-dependent effective permeability, μeff(T), and the effective intergranular local field, Heffj(HDCa, T), which depends on the applied field, HDCa and the thermal and magnetic history, accounting for the observed hysteresis. A method to determine field-independent intergranular critical-state parameters (critical current at zero field and temperature-dependent density of pinning forces as well as μeff(T)) and the proper scaling of Heffj(HDCa, T) for ZFC and FC conditions is described. The calculated AC susceptibility for the whole temperature range for both magnetic conditions reproduces the main features of the experimental results. © 1994.

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