Anisotropy of Vortex-Liquid and Vortex-Solid Phases in Single Crystals of Bi2Sr2CaCu2O8+δ: Violation of the Scaling Law
J. Mirkovic, S. E. Savel'ev, E. Sugahara, K. Kadowaki
Abstract
The vortex-liquid and vortex-solid phases in single crystals of Bi2Sr2CaCu2O8+δ placed in tilted magnetic fields are studied by in-plane resistivity measurements using the Corbino geometry to avoid spurious surface barrier effects. It was found that the anisotropy of the vortex-solid phase increases with temperature and exhibits a maximum at T≈ 0.97 Tc. In contrast, the anisotropy of the vortex-liquid rises monotonically across the whole measured temperature range. The observed behavior is discussed in the context of dimensional crossover and thermal fluctuations of vortices in the strongly layered system.
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