Abstract
We have measured the normal state magnetization for grain-aligned HgBa 2Ca 2Cu 3O 8+ δ with high and low magnetic fields applied perpendicular to the CuO 2 planes. The high-field magnetization curves follow the three-dimensional scaling based on the Ginzburg-Landau theory. In addition, we observed significant superconducting fluctuation diamagnetism above T c using a low magnetic field, and analyzed it by utilizing the modified Lawrence-Doniach model. Our result demonstrates the dimensional crossover from 3D to 2D as the temperature increases, which is consistent with the scaling result of a high-field limit. From the analysis, we obtained the upper critical field slope, zero-temperature GL coherence length, and mass anisotropy.
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