c-axis dissipation and vortex phases in Bi2Sr2CaCu2O8+x crystals

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Pohang Univ of Science and, Technology, Pohang, Korea, Republic of [1 ]
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Solid State Commun | / 1卷 / 25-29期
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Bismuth compounds - Electric conductivity measurement - Electron transport properties - Magnetic field effects - Phase transitions - Synthesis (chemical);
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摘要
We report on measurements of the resistivities of Bi2Sr2CaCu2O8+x crystals along the c axis (ρc) as well as in the ab plane (ρab) in magnetic fields applied parallel to the c-axis (H c) from 10 Oe to 60 kOe. From the temperature dependence of the resistivity ratio ρab/ρc in relatively low magnetic field below 1 kOe, we identified the vortex-solid, pancake-vortex and possible line-vortex phases. This suggests that a vortex solid in highly anisotropic high-Tc superconductors like Bi2Sr2CaCu2O8+x crystals, at least in this nonequilibrium situation, exhibits a two-stage transition into a vortex gas via a vortex liquid.
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