2016-4-25 10:30, 量子物質科學協同創新中心 & 物理系seminar：

報告題目： Unusual interplay between superconductivity and magnetism in CeAu2Si2 under pressure 報告人：任之（日内瓦大學）報告時間： 2016-4-25 10:30 報告地點：理科樓三樓報告廳（C302）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). 個人簡介：任之，1982年生，2009年畢業于浙江大學，獲凝聚态物理博士學位。2009年至今在日本大阪大學，瑞士日内瓦大學進行博士後研究，主要對象包括非常規超導體和拓撲量子材料。在知名學術期刊共發表論文44篇，總引用超過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以亮點進行報道。