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首页> 外文会议>8th International Workshop on Critical Currents in Superconductors Kitakyusbu, Japan 27-29 May 1996 >Study on the relationship between the peak effect and the flux line lattice melting of single crystalline Bi_2Sr_2CaCu_2O_(8+ delta )
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Study on the relationship between the peak effect and the flux line lattice melting of single crystalline Bi_2Sr_2CaCu_2O_(8+ delta )

机译：单晶Bi_2Sr_2CaCu_2O_（8+ delta）的峰效应与流线晶格熔化的关系研究

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摘要

We have measured dc-magnetization of Bi_2Sr_2CaCu_2O_(8+ delta ) single crystals with three defferent doping levels: over-doped, optimum-doped and under-doped, using a conventional SQUID magnetometer in a magnetic field parallel to the c-axis of the crystal. A small but distinct jump was observed in the magnetization curve in all samples. The jump is considered to be the vortex lattice melting, which was first observed by Zeldov et al.~1 by using a micro-Hall probe array. The temperature dependence of the vortex line lattice melting line deduced from the jump in magnetization curves saturates below about 40K with decreasing temperature to the magnetic field at 65 mT(over-doped) and at 15 mT(under-doped). It appears that the melting line is terminated and smoothly connected to the 2D-3D transition of the vortex lines, where the peak effect is observed.
机译：我们已经测量了Bi_2Sr_2CaCu_2O_（8+ delta）单晶在三种不同掺杂水平下的直流磁化强度：使用传统的SQUID磁力计在平行于c轴的磁场中使用了过量掺杂，最佳掺杂和掺杂不足。水晶。在所有样品的磁化曲线中均观察到一个小的但明显的跳跃。跳跃被认为是旋涡晶格熔化，这是Zeldov等人[1]首先使用微型霍尔探针阵列观察到的。从磁化曲线中的跃迁推导出的涡旋线晶格熔解线的温度依赖性在温度降低时在65 mT（超掺杂）和15 mT（低掺杂）下随着温度的降低而饱和。看来熔解线已终止，并顺利连接到涡旋线的2D-3D过渡处，在此处观察到了峰值效应。

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