时间：2024年6月13日（周四）下午14:00-15:30

Time：14:00-15:30, Thursday, June 13^th, 2024

主持人: 西湖大学理学院PI 吴颉 博士

Host: Dr. Jie Wu, PI of School of Science, Westlake University

地址：西湖大学云谷校区 E10-315

Venue: E10-315, Yungu Campus, Westlake University

讲座语言：中文

Lecture Language: Chinese

赵俊 教授

复旦大学 物理系

Prof. Jun Zhao

Department of Physics, Fudan University

主讲人/Speaker：

Prof. Jun Zhao is the Professor in the Department of Physics at Fudan University, where he has been a faculty member since 2012. He received his B.S. degree from Tsinghua University in 2002 and his M.S. degree from the Institute of Physics, Chinese Academy of Sciences in 2005. He earned his Ph.D. in Physics from the University of Tennessee, Knoxville, in 2010, and subsequently was a Miller Research Fellow at UC Berkeley. His research primarily focuses on utilizing various neutron scattering techniques to investigate phase transitions and spin dynamics in strongly correlated systems, including high-temperature superconductors and quantum magnetic materials. Additionally, he works on the growth of large-scale, high-quality single crystal samples and the measurement of their thermodynamic and transport properties. Over the years, he has received numerous honors, including the "Sir Martin Wood China Prize" (2018), the "Changjiang Distinguished Professor Award" (2017), and the "Qiushi" Outstanding Young Scholar Award (2014).

讲座摘要/Abstract:

Despite nearly four decades of intensive research on various cuprates, the mechanism responsible for high-temperature superconductivity remains elusive. The investigation of high-temperature superconductors that do not rely on copper has become a focal point of intense exploration, as these materials may help elucidate the enigmatic mechanisms governing high-temperature superconductivity. In this talk, I will present neutron scattering studies of magnetic correlations and their interplay with superconductivity in various iron-based superconductors. Additionally, I will discuss our recent research that uncovered bulk superconductivity with a maximum critical temperature of around 30 K in pressurized trilayer nickelate La₄Ni₃O₁₀-δ single crystals. Our investigations reveal that pressurizing La₄Ni₃O₁₀-δ suppresses spin and charge order, leading to bulk superconductivity with a superconducting volume fraction exceeding 80%. In the normal state, we observe a “strange metal” behavior, characterized by a linear temperature-dependent resistance extending up to 300 K. Furthermore, the layer-dependent superconductivity observed hints at a unique interlayer coupling mechanism specific to nickelates, setting them apart from cuprates in this regard. This finding provides a new material platform to explore the intricate interplay between the spin/charge order, flat band structures, interlayer coupling, strange metal behavior and high-temperature superconductivity.

讲座联系人/Contact:

Mengzhen Zhong, School of Science, Email: zhongmengzhen@westlake.edu.cn