报告人： 王操 副教授 山东理工大学

时间：   2019年9月10日上午 10：00-11：00

地点：    知新楼C座 1111室

邀请人： 王春明 教授

内容简介：

For most of the iron-based superconductors, superconductivity emerges when the anti-ferromagnetic ground state in the parent compound is suppressed by element substitutions or physical pressure. In the year 2016, we discovered a new ZrCuSiAs-type nitride superconductor ThFeAsN which show superconductivity of 30 K without chemical doping.[1] Superconductivity in ThFeAsN is ascribed to internal chemical pressure effects manifested by the extremely small value of As height with respect to the Fe plane. Sucedentently, we synthesis samples of oxygen doped ThFeAsN1-xOx (0 ≤ x ≤ 0.6) system.[2] With the oxygen substitution, the Tc value decreases rapidly to below 2 K for 0.1 ≤ x ≤ 0.2, and surprisingly, superconductivity re-appears in the range of 0.25 ≤ x ≤ 0.5 with a maximum Tconset of 17.5 K at x = 0.3. The peculiar phase diagram in ThFeAsN1-xOx presents additional ingredients for understanding the superconducting mechanism in iron-based superconductors.

References：

1. C. Wang, Z. C. Wang, Y. X. Mei, et al., J. Am. Chem. Soc. 138, 2170.

2. C. Wang, Z. C. Wang, J. L. Wang, et al.,. J. Phys.: Condens. Matter 30, 255602.

报告人介绍：

王操，山东理工大学 副教授，主要从事新型超导体的结构探索和物性研究。2002年毕业于山东师范大学，2011年毕业于浙江大学，获得凝聚态物理专业博士学位。之后赴澳大利亚伍伦贡大学从事博士后研究。目前已发表SCI论文30余篇，累计被引用1000余次。