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arXiv 0810.1947cond-mat.supr-con
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费米面和序参量驱动的无孪晶YBa2Cu3O7涡旋晶格结构相变

Fermi surface and order parameter driven vortex lattice structure transitions in twin-free YBa2Cu3O7

J. S. White, V. Hinkov, R. W. Heslop, R. J. Lycett, E. M. Forgan, C. Bowell, S. Straessle, A. B. Abrahamsen, M. Laver, C. D. Dewhurst, J. Kohlbrecher, J. L. Gav… 展开作者

J. S. White, V. Hinkov, R. W. Heslop, R. J. Lycett, E. M. Forgan, C. Bowell, S. Straessle, A. B. Abrahamsen, M. Laver, C. D. Dewhurst, J. Kohlbrecher, J. L. Gavilano, J. Mesot, B. Keimer, A. Erb

摘要:

本文报道了在2K和10.8T磁场条件下,用小角中子散射方法研究YBa_2Cu_3O_7的内禀涡旋晶格结构.由于抑制钉扎到孪晶畴界,一个新的扭曲的六方VL结构相是稳定在中间领域。它是从一个低场不同的取向和扭曲的六方相分离的一级跃迁在2.0(2)T,这可能是由费米表面效应驱动。我们认为,在6.7(2)T的另一个一阶跃迁,到一个菱形结构的相反符号的失真,标志着一个交叉的制度,费米表面各向异性是占主导地位的,VL结构和失真是由序参数各向异性控制。

英文摘要:

We report on small-angle neutron scattering studies of the intrinsic vortex lattice (VL) structure in detwinned YBa2Cu3O7 at 2 K, and in fields up to 10.8 T. Because of the suppressed pinning to twin-domain boundaries, a new distorted hexagonal VL structure phase is stabilized at intermediate fields. It is separated from a low-field hexagonal phase of different orientation and distortion by a first-order transition at 2.0(2) T that is probably driven by Fermi surface effects. We argue that another first-order transition at 6.7(2) T, into a rhombic structure with a distortion of opposite sign, marks a crossover from a regime where Fermi surface anisotropy is dominant, to one where the VL structure and distortion is controlled by the order-parameter anisotropy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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