Abstract
The magnetization of a large single crystal of HoBa 2Cu 3O 7 exhibits several new features associated to the anisotropy (and sample size) : at low temperature large magnetization jumps are observed which depend on the field variation rate and thermalization of the sample. At high temperature the hysteresis loops, M(H), are convex lens shaped which gives a maximum of the current density J c(H). The anisotropic critical currents can be compared with values obtained in small crystals. The anisotropic critical currents can be compared with with value obtained in small superconducting state. A large crystal field anomaly is observed around 80 K for H applied along the c direction.
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