Speaker: 任之 (日内瓦大学)

Time: April 25, 2016 10:30

Place: 理科楼三楼报告厅C302

报告摘要：High pressure provides a powerful means for exploring unconventional superconductivity which appears mostly on the border of magnetism [1]. Here we present the discovery of pressure-induced heavy-fermion superconductivity up to 2.5 K in high-quality crystals of the antiferromagnet CeAu2Si2 [2]. Unexpectedly, the resulting pressure-temperature phase diagram reveals a highly unusual interplay of superconductivity with magnetism, and differs markedly from that of all known Ce-based pressure-induced superconductors. In particular, for the first time, both superconductivity and magnetism are enhanced with pressure over a broad pressure range. Near pc, the depression of bulk Tc with the increase of residual resistivity can be well understood in terms of pair breaking by nonmagnetic disorder, strongly suggesting an unconventional pairing state [3]. 

Reference:

[1] G.Knebel et al., Comptes Rendus Physique 12, 542 (2011).

[2] Z. Ren et al., PRX 4, 031005 (2014).

[3] Z. Ren et al., PRB 91, 094515 (2015).

 

个人简介：任之，1982年生，2009年毕业于浙江大学，获凝聚态物理博士学位。2009年至今在日本大阪大学，瑞士日内瓦大学进行博士后研究，主要对象包括非常规超导体和拓扑量子材料。在知名学术期刊共发表论文44篇，总引用超过3000次，Hisrch h-因子27，其中部分成果被Nature Physics News and views, NPG Asia Materials, 和APS Physics以亮点进行报道。