报告题目：Competing orders/fluctuations in high-temperature superconductors probed by ARPES

报 告 人：Atsushi Fujimori，Department of Physics, University of Tokyo

报告时间：2015年12月10日（周四）下午14:30

报告地点：物理系三楼报告厅

报告摘要：Competition between magnetism, charge order, and superconductivity observed in various high-temperature superconductors has been the subject of extensive research. Through the observation of band folding signature caused by such orders or fluctuations, ARPES yields deep insights into the nature of competing orders whose fluctuations might enhance the superconductivity. In this talk, two dramatic observations are presented and discussed: (i) In electron-doped cuprates after “protect annealing”, the band folding due to short-range antiferromagnetic order is suppressed while the signature of charge fluctuations remains as strong as the hole-doped cuprates [1]. (ii) In a parent compound BaFe2As2 of iron-based superconductors, the band folding signature of the antiferromagnetic order persists well above the Neel temperature, i.e., into the so-called “nematic phase”, which we attribute to the existence of antiferro-orbital component in the latter phase.

Reference： [1] M. Hiroi et al., arXiv:1502.03395.