Power-law resistivity, magnetic relaxation and ac susceptibility
- Centre National de la Recherche Scientifique (CNRS), 38 - Grenoble (France). Centre de Recherches sur les Tres Basses Temperatures
- Argonne National Lab., IL (United States)
The nonlinear diffusion of magnetic flux into a superconducting sample can be studied by measuring the relaxation of the magnetisation after application of a step field or by measuring the ac susceptibility, {chi}{sub 1} and its third harmonic, {chi}{sub 3}, or preferably both methods covering different time scales. Each has been analysed recently for a field-cooled sample of a material whose creep activation energy depends logarithmically on current density, J corresponding to a power-law relation between electric field, E and J. Here, results are compared, using a universal scaling depth. Maximum {chi}{sub 1}{double_prime} {vert_bar}{chi}{sub 3}{vert_bar} and values occur, and also the magnetisation has relaxed to half its initial value when the scaling depth is comparable to the sample half-thickness.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10175267
- Report Number(s):
- ANL/MSD/CP--83799; CONF-940701--18; ON: DE94016893
- Country of Publication:
- United States
- Language:
- English
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