Colloquium
Neutron Scattering studies of iron arsenide superconductors

日期:2009-12-16 阅读:851

摘要

In this colloquium, I describe the most recent progress in the field of iron-based superconductors. Using neutron scattering as a probe, we study spin excitations in FeAs-based superconductors and its undoped parent compounds. For the undoped CaFe2As2, we determine the entire spin wave dispersion curve and show that magnetic exchange coupling has strong in-plane exchange anisotropy with no evidence for Stoner continuum. Upon doping to induce superconductivity, we find that the spin excitations spectrum is dominated by a large spin gap and a neutron spin resonance. We show that the resonance is directly connected with superconducting electronic gap. These results suggest that spin excitations are the most promising candidate for electron pairing and superconductivity in iron-based superconductors.

报告人简介

Professor Dai’s website: http://pdai.phys.utk.edu/index.php


地址:上海市东川路800号理科实验楼群
邮编:200240

沪交ICP备05010
© 上海交通大学物理与天文学院 版权所有

微信公众号