Superconductivityat 250 K in lanthanum hydride under high...

2020-12-03 吉林大學

報告題目:Superconductivityat 250 K in lanthanum hydride under high pressures

報告人: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 temperaturesTcranging between 240 and 320 K is predicted at megabarpressures. Here, we report superconductivity with a recordTc~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 ofTcunder an external magnetic field, which suggests anupper critical magnetic field of ~120 T at zero temperature. The pressuredependence of the transition temperaturesTc(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.

報告時間:2019年2月23日(周六)上午10:00

報告地點:前衛南區唐敖慶樓C區603報告廳

舉辦單位:超硬材料國家重點實驗室

                物理學院

                吉林省物理學會

                中國物理學會高壓物理專業委員會

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