Abstract
In-plane anisotropy of the resistivity and phase transition of the Josephson-vortex system have been studied in YBCO crystals with different oxygen-contents. Angular dependences of the resistivity are represented by superposition of four-fold anisotropy with a sharps dip for H ∥ a - and b -axes and two-fold one in under-doped and over-doped crystals. Only two-fold in-plane anisotropy appears in optimally-doped ones. The anisotropic behaviors are described by the superconducting fluctuation and the Josephson-vortex pinning effect. The resistive transition for H ∥ a - and b -axes shows sharp drop to zero resistivity accompanied with the first-order phase transition in the optimally-doped crystals. It is characterized by the second-order vortex-glass transition in over-doped and under-doped ones. It is indicated that the Josephson-vortex pinning is important in the determination of the in-plane anisotropy of the resistivity and the phase transition.
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