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arXiv 1108.2176cond-mat.supr-con
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无孪晶YBa2Cu3O7中涡旋相互作用的磁场诱导非局域效应

Magnetic-field-induced nonlocal effects on the vortex interactions in twin-free YBa2Cu3O7

J. S. White, R. W. Heslop, A. T. Holmes, E. M. Forgan, V. Hinkov, N. Egetenmeyer, J. L. Gavilano, M. Laver, C. D. Dewhurst, R. Cubitt, A. Erb

摘要:

在2 K和平行于晶体c轴的磁场作用下,高k超导体YBa_2Cu_3O_7中的涡旋晶格(VL)随外加磁场的变化经历了一系列不同结构之间的转变.然而,仅从结构研究,这是不可能的,以精确地确定系统的各向异性,控制不同结构之间的过渡。为了解决这个问题,在这里,我们报告新的小角度中子散射测量的VL结构在较高的温度下,和场和温度依赖的VL形状因子。我们的测量结果表明,各向异性的VL,在理论上可以参数化的非局部校正的影响,变得越来越重要,随着磁场的增加,并通过增加对Tc的温度抑制。数据表明,由于不同的各向异性的非局域性发挥重要作用,在确定VL属性。

英文摘要:

The vortex lattice (VL) in the high-kappa superconductor YBa2Cu3O7, at 2 K and with the magnetic field parallel to the crystal c-axis, undergoes a sequence of transitions between different structures as a function of applied magnetic field. However, from structural studies alone, it is not possible to determine precisely the system anisotropy that governs the transitions between different structures. To address this question, here we report new small-angle neutron scattering measurements of both the VL structure at higher temperatures, and the field- and temperature-dependence of the VL form factor. Our measurements demonstrate how the influence of anisotropy on the VL, which in theory can be parameterized as nonlocal corrections, becomes progressively important with increasing magnetic field, and suppressed by increasing the temperature towards Tc. The data indicate that nonlocality due to different anisotropies play important roles in determining the VL properties.

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