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arXiv 1409.2183cond-mat.supr-con
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铜氧化物超导体中的倾斜环电流

Tilted loop currents in cuprate superconductors

Victor M. Yakovenko

摘要:

本文简要介绍了铜氧化物超导体赝能隙相的极性克尔效应和时间反演对称性破缺的理论模型。通过消除,最有希望的候选者是倾斜的环电流模型,从西蒙-瓦尔马模型通过倾斜一个三角形环向上和另一个向下朝向顶端的氧。该模型是一致的PKE,自旋极化中子散射,光学各向异性测量。该模型中的自发电流在面内氧和顶端氧之间流动,使得每个氧属于一个电流回路。这种回路电流模式类似于磁电反铁磁体Cr2 O3中的自旋序,其中实验观察到PKE。通过类比,应该可以训练铜氧化物中的PKE符号。提出了几个实验来确认回路电流的顺序:磁场感应极性,非线性异常霍尔效应,和二次谐波产生。

英文摘要:

The paper briefly surveys theoretical models for the polar Kerr effect (PKE) and time-reversal symmetry breaking in the pseudogap phase of cuprate superconductors. By elimination, the most promising candidate is the tilted loop-current model, obtained from the Simon-Varma model by tilting one triangular loop up and another one down toward the apical oxygens. The model is consistent with the PKE, spin-polarized neutron scattering, and optical anisotropy measurements. Spontaneous currents in this model flow between the in-plane and apical oxygens in such a manner that each oxygen belongs to one current loop. This loop-current pattern is similar to the spin order in the magnetoelectric antiferromagnet Cr2O3, where the PKE is observed experimentally. By analogy, it should be possible to train the PKE sign in the cuprates magnetoelectrically. Several experiments are proposed to confirm the loop-current order: the magnetic-field-induced polarity, the nonlinear anomalous Hall effect, and the second-harmonic generation.

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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