报告题目：Superconductivityat 250 K in lanthanum hydride under high pressures

报告人：Prof. Mikhail I.Eremets

             Max Planck Institute for Chemistry,Germany

Abstract:Firstprinciples calculations suggested a new family of hydrides possessing aclathrate structure, where the host atom (Ca, Y, La) is at the center of thecage formed by hydrogen atoms. For LaH₁₀superconductivity, withcritical temperaturesT_cranging between 240 and 320 K is predicted at megabarpressures. Here, we report superconductivity with a recordT_c~250 K within theFm-3mstructure of LaH₁₀at apressureP~170 GPa. We proved theexistence of superconductivity at 250 K through the observation ofzero-resistance, isotope effect, and the decrease ofT_cunder an external magnetic field, which suggests anupper critical magnetic field of ~120 T at zero temperature. The pressuredependence of the transition temperaturesT_c(P) has a maximum of 250-252 K at thepressure of about 170 GPa. This leap, by 50 K, from the previousTcrecord of 203 K indicates the realpossibility of achieving RTSC (that is at 273 K) in the near future at highpressures and the perspective of conventional superconductivity at ambientpressure.

Author:Mikhail I. Eremets is the group leader of High Pressure Chemistry and PhysicsGroup in Max Planck Institute for Chemistry in Germany. He is an experimentalistin high pressure physics, chemistry, and materials science. He discoveredsuperconductivity with the highest critical temperature of 203 K and 250 K insulfur and Lanthanum hydride successively; conductive hydrogen; polymericnitrogen and others.

报告时间：2019年2月23日（周六）上午10:00

报告地点：前卫南区唐敖庆楼C区603报告厅

举办单位：超硬材料国家重点实验室

                物理学院

                尊龙凯时省物理学会

                中国物理学会高压物理专业委员会