自旋分辨 ARPES 揭示 Sr2RuO4 中单重态和三重态的破缺
超导电性
2014-03-31 v2
摘要
自旋 - 轨道耦合被推测在 Sr2RuO4 的低能电子结构中起关键作用。利用圆偏振光结合自旋和角度分辨光电子能谱，我们直接测得有效自旋 - 轨道耦合值为 130 +/- 30 meV。该值甚至大于理论预测，并与费米面附近 dxy 和 dxz,yz 轨道的能级分裂相当，导致自旋和轨道特征出现强烈的动量依赖纠缠。正如从零总动量电子对的自旋期望值所证明的那样，基于纯单重态或三重态的库珀对分类从根本上破缺，必须用这些新发现的自旋 - 轨道纠缠本征态来描述 Sr2RuO4 的非常规超导态。
引用
@article{arxiv.1303.5444,
title = {Breakdown of singlets and triplets in Sr2RuO4 revealed by spin-resolved ARPES},
author = {C. N. Veenstra and Z. -H. Zhu and M. Raichle and B. M. Ludbrook and A. Nicolaou and B. Slomski and G. Landolt and S. Kittaka and Y. Maeno and J. H. Dil and I. S. Elfimov and M. W. Haverkort and A. Damascelli},
journal= {arXiv preprint arXiv:1303.5444},
year = {2014}
}
备注
Accepted for publication in PRL. A high-resolution version with supplementary material can be found at http://www.phas.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/SpinOrbitInSr214.pdf