A scaling law for ac susceptibility of an YBa{sub 2}Cu{sub 3}O film in a perpendicular ac field
- Department of Physics, National University of Singapore, (Singapore) 119260
The ac susceptibility (ACS) of an YBa{sub 2}Cu{sub 3}O thin film in a perpendicular ac magnetic field (H{sub a}) from 0.22 to 30.8 G is measured as a function of temperature. The temperature dependence of the real ({chi}{sup {prime}}) and imaginary ({chi}{sup {prime}{prime}}) parts of the ACS for various H{sub a} can be well scaled onto a single curve using the peak value ({chi}{sub p}{sup {double_prime}}) and temperature (T{sub p}) of {chi}{sup {prime}{prime}}(T) as the scaling parameters. The scaling law suggests that the critical state can be established only below T{sub p}. Above T{sub p}, the ACS is determined by the screening effect of the film due to the sharp decrease of its resistance. Below T{sub p}, the scaling behavior is in agreement with the theoretical approaches based on the critical state model, only if the temperature for zero critical current density is related to the irreversibility temperature T{sub irr} rather than T{sub c}. From the scaling law, we found that T{sub irr}=T{sub p}. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 542528
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 71; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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