Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
Paper
Anisotropy of flux penetration into BiSrCaCuO crystals
Abstract
The onset of flux penetration in crystals of two-layer BiSrCaCuO is determined from measurements of the zero-field-cooled dc magnetization. For magnetic fields applied in the a-b plane, a flux penetration anomaly shifts linearly to lower temperature with increasing field, indicating low-temperature Hc1 values of 80-140 Oe, within a factor of two of the values for YBaCuO crystals. The much larger anisotropy reported earlier is suggested to arise from extrinsic intergrowths. © 1989.
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