Thermodynamics of the hydrogen dominant potassium hydride superconductor at high pressure

Abstract

In the present paper we report comprehensive analysis of the thermodynamic properties of novel hydrogen dominant potassium hydride superconductor (KH${}_6$). Our computations are conducted within the Eliashberg theory which yields quantitative estimations of the most important thermodynamic properties of superconducting phase. In particular, we observe, that together with the increasing pressure all the thermodynamic properties decrease, e.g. $T_C\in ⟨72.91,55.50⟩$ K for $p\in ⟨166,300⟩$ GPa. It is predicted that such decreasing behavior corresponds to the decreasing hydrogen lattice molecularization with increasing pressure value. Futhermore, by calculating the dimensionless thermodynamic ratios, familiar in the Bardeen-Cooper-Schrieffer theory (BCS), it is proved that KH${}_6$ material is a strong-coupling superconductor and cannot be quantitatively described within the BCS theory.

References in corpus (1)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials

Cited by in corpus (1)

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