Interplay of superconductivity and magnetism in Fe1+y(Te,Se)

 

Zhiqiang Mao

Dept. of Physics and Engineering Physics

Tulane University,

New Orleans, LA 70118,

USA

 

 

The discovery of high temperature superconductivity in Fe-based compounds has generated tremendous excitement. Fe1+y(Te,Se) is one of important  ferrous superconductor systems. Since this system has a simplified structure, it is believed to provide an important testing ground for unconventional superconductivity. In this talk, I will introduce our recent studies on superconductivity and magnetism of this system. I will focus on the following four issues: 1) the evolution of superconductivity and phase diagram of Fe1+y(Te,Se); 2) magnetic structure of undoped parent compound Fe1+yTe; 3) the effect of excess Fe on superconductivity and magnetism; 4) spin resonance at the superconducting state. Finally I will discuss the interplay of superconductivity and magnetism in terms of our results.