Title: Recent Studies on Synthesis and Structures of Metal Hydrides under Ultra-high Static and Dynamic Pressures Aiming for High Tc

Speaker: Professor Jaeyong Kim (Department of Physics, Hanyang University)

Time and Location: Nov. 16th (Wed), 5-6 PM. Science Building AB101

Abstract

Recently experimental results revealed that doping hydrogen by an impurity is a possible route to form high-transition temperature superconductors (SCs) by enhancing the electron-phonon coupling. DFT calculations suggest that alkali metals, where electrons can play either donor or acceptor, are good impurity elements combining hydrogen for evaluating the high-Tc SCs. Stable polyhydrides of alkali metals have been predicted by theoretical analysis of MHn (M=Li, Na, K, Rb, Cs, n>5) compounds with variable hydrogen composition. Potassium (K), for example, has been proposed as a promising candidate for pressure-induced SC (~60 K at 166 GPa), but no experimental report on the structure and transport properties have been reported. This may be due to the experimental difficulties handling the sample at high temperature and pressure without exposing it to air.

In this talk, the synthesis, analysis, structures, and transport properties of metal ployhydrides under “extreme conditions” employing a diamond anvil cell and a laser heating system will be introduced, with recent studies on alkali-metal-based polyhydrides.

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dferere

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