Broken time-reversal symmetry in the superconducting state of Sr2RuO4
Broken time-reversal symmetry in the superconducting state of Sr2RuO4
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Sr2RuO4 超导态时间反演对称性破缺
DOI：
10.1103/physrevb.76.212501
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发表时间：
2007
影响因子：
3.7
通讯作者：
V. Mineev
中科院分区：
文献类型：
--
作者：
V. Mineev
利用现象学双流体模型，推导了超导体表面破缺时间反转对称状态下反射光偏振方向的克尔旋转。我们认为这种效应是最近由Xia等人（physical . rev . lett）在$Sr_2RuO_4$超导态中发现的。[\bf 97}, 16702(2006)]来源于该超导体的自发磁化。建立了温度和频率对效应的依赖关系。结果表明，该效应是由两种机制之一决定的，这取决于光的频率大于或小于等离子体频率。本文的初稿没有考虑到穿透皮肤层的光的电场产生的化学势梯度的机制，在大于等离子体频率的频率下很重要（V.P.Mineev, arXiv:cond-mat/0703624v2）。
Using a phenomenological two-fluid model we derive the Kerr rotation of the polarization direction of reflected light from the surface of a superconductor in a state breaking time-reversal symmetry. We argue that this effect found recently in the superconducting state of $Sr_2RuO_4$ by Xia et al (Phys.Rev.Lett. {\bf 97}, 167002 (2006)) originates from the spontaneous magnetization in this superconductor. The temperature and the frequency dependencies of the effect are established. It is shown that the effect is determined by one of two mechanisms depending on the frequency of light that is larger or smaller than the plasma frequency. The mechanism originating from the gradient of chemical potential created by the electric field of light penetrating into the skin layer and important at frequencies larger than the plasma frequency was missed in the preliminary version of this paper (V.P.Mineev, arXiv:cond-mat/0703624v2).