ac losses in circular disks of thin YBa2Cu3O7 films in perpendicular magnetic fields
作者： M. Suenaga , V. F. Solovyov , Q. Li , Z. Ye , H. J. Wiesmann
DOI: 10.1063/1.1579130
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摘要: The ac losses at 20 and 30 Hz were measured for two disk-shaped YBa2Cu3O7 films in perpendicular peak applied magnetic fields up to ∼0.2 T liquid nitrogen. One of the had a significantly higher critical-current density than other as determined from loss measurements. Also, it exhibited more-uniform flux penetration around circumference disk observed by magneto-optical images these dc fields. results this film compared with theoretical predictions disks thin superconducting using Bean model [J. R. Clem A. Sanchez, Phys. Rev. B 55, 9355 (1994)], Kim [D. V. Shantsev et al., 61, 9699 (2000)]. asymptotic low high reasonably good agreement data. numerical calculation following al. was found give extremely ...
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