Detailed study of the superconducting properties in compressed germane

Radosław Szczȩśniak and Artur P. Durajski ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2015, vol. 88, issue 12, 1-6

Abstract: Hydrogen-rich compounds under extreme pressure are the most promising systems for searching a high-temperature superconductivity. In presented paper, we report analysis of the thermodynamic properties of hydrogenated germanium (germane, GeH 4 ) at 220 GPa obtained within the framework of the Migdal-Eliashberg theory. We observe that together with the increase of Coulomb pseudopotential from 0.1 to 0.3 the critical temperature decreases from 92.36 K to 52.80 K. A similar trend is also well-visible in the case of other thermodynamic properties. Moreover, we study the influence of external pressure on the superconducting state of GeH 4 . On this basis we conclude that increase of pressure from 20 to 220 GPa has a pronounced effect on the thermodynamic stability of germane. Finally, it is proved that the properties of the superconducting state of GeH 4 differ markedly from predictions of the Bardeen-Cooper-Schrieffer (BCS) theory. Copyright The Author(s) 2015

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1140/epjb/e2015-60752-6

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