https://doi.org/10.1140/epjb/e2015-60752-6
Regular Article
Detailed study of the superconducting properties in compressed germane
Institute of Physics, Częstochowa University of
Technology, Ave. Armii Krajowej
19, 42-200
Częstochowa, Poland
a e-mail: adurajski@wip.pcz.pl
Received:
18
September
2015
Received in final form:
28
October
2015
Published online:
21
December
2015
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, GeH4) 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 GeH4. 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 GeH4 differ markedly from predictions of the Bardeen-Cooper-Schrieffer (BCS) theory.
Key words: Solid State and Materials
© The Author(s) 2015. This article is published with open access at Springerlink.com
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