报告人：陈晓嘉    教授

题   目：Superconductivity of Copper Oxides under Pressure

时   间：07月19日（星期二）下午2:30

地   点：固体所小楼二楼报告厅

报告摘要：

Superconductivity offers powerful new opportunities for restoring the reliability of the power grid and increasing its capacity and efficiency. The key issue in superconductivity research is to find materials with high critical temperaturesT_C’s so that all operations can be done at ambient conditions. Currently, cuprate superconductors remain the superconducting materials having highestT_C’s both at ambient condition and under pressure. Here we introduce our efforts in exploring effective ways to enhance superconductivity in these materials. One of our experimental findings is that one can enhance remarkablyTc through the suppression of competing order in the inner CuO₂plane(s) of multilayer cuprates and through the optimization of two competing energy scales (pairing and phase ordering) of different CuO₂planes. We also present our recent results of electronic Raman spectra of cuprates with different doping levels at high pressures. The results are used to identify the mechanism of superconductivity in high-Tc cuprates. Our results have important implications for designing and engineering superconductors with much higherT_C’s at ambient conditions.

报告人简介：

Xiao-Jia Chen is a specially appointed professor of Institute for Solid State Physics, Chinese Academy of Sciences and a research scientist at Carnegie Institution of Washington. His interests cover superconductivity, magnetism, and electric behavior of hydrogen-rich materials at extreme conditions. He has published over 50 papers in these fields with 1 in Nature, 4 in PNAS, 3 in PRL, 23 in PRB.