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首页> 外文期刊>Physical review >Vortex states and magnetic anisotropy in single-crystal La_(2-χ)Sr_χCuO_4 studied by torque magnetometry
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Vortex states and magnetic anisotropy in single-crystal La_(2-χ)Sr_χCuO_4 studied by torque magnetometry

机译：扭矩磁强法研究La_（2-χ）Sr_χCuO_4单晶的涡态和磁各向异性

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摘要

The cuprate superconductors have highly anisotropic, layered structures. This causes the flux lattice penetrating them in the intermediate state to undergo dramatic changes when the direction of the applied magnetic field approaches the CuO_2 planes. We present highly sensitive torque measurements on tiny La_(2-χ)Sr_χCuO_4 single crystals showing these regimes of vortex structure and their influence on the determination of the magnetic anisotropy parameter γ. Systematic measurements of torque as a function of magnetic field magnitude and orientation at various temperatures below T_c made it possible to determine the conditions under which the structural changes occur, allowing a reliable determination of γ. The values of γ obtained for La_(2-χ)Sr_χCuO_4 as a function of doping χ, covering the whole doping regime (underdoped, optimally doped, and overdoped), are in good agreement with earlier results, indicating a flow toward quasi-two-dimensionality in the under-doped limit.
机译：铜酸盐超导体具有高度各向异性的层状结构。当所施加的磁场的方向接近CuO_2平面时，这会导致在中间状态下穿透它们的磁通晶格发生剧烈变化。我们对微小的La_（2-χ）Sr_χCuO_4单晶进行了高灵敏的扭矩测量，显示了这些涡结构及其对磁各向异性参数γ的影响。在低于T_c的各种温度下，根据磁场强度和方向进行的扭矩系统测量可以确定发生结构变化的条件，从而可以可靠地确定γ。 La_（2-χ）Sr_χCuO_4的γ值随掺杂χ的变化而变化，覆盖整个掺杂体系（未掺杂，最佳掺杂和过量掺杂），与早期结果吻合良好，表明流向准二掺杂极限中的三维。

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