The single- vs. two-gap scenario: the specific heat and the thermodynamic critical field of BeAu superconductor

Abstract

The puzzling situation where some thermodynamic quantities require a single-gap description, while others need a more complex gap scenario, is discussed. Our approach reveals that in some cases, the conclusions based on measurements of only one thermodynamic quantity may lead to conflicting results. As an example, temperature evolutions of the electronic specific heat [$C_{\mathrm{e}}(T)$] and the thermodynamic critical field [$B_{\mathrm{c}}(T)$] of BeAu superconductor were reconsidered within the framework of the single-gap and the two-gap scenarios. The analysis shows that the single-gap approach describes the temperature dependencies of $C_{\mathrm{e}}(T)$ and the superfluid density ${\rho }_{\mathrm{s}}(T)$ satisfactorily. However it fails in the case of $B_{\mathrm{c}}(T)$. The self-consistent two-gap model, in contrast, is able to describe all of the mentioned thermodynamic quantities by using a similar set of parameters. Our results reveal that a proper description of the thermodynamic quantities, related to the superconducting pairing mechanism, requires the use of similar model containing the same set of parameters.

8 pages, 5 figures

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• Isotropic single gap superconductivity of elemental Pb: the `smiling' approach
• Anomalous gap ratio in anisotropic superconductors: aluminum under pressure
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• Influence of pressure on properties of multi-gap type-I superconductor BeAu
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• Multiband superconductivity in the topological Kramers nodal-line semimetals
• Fermi surface and topology of multiband superconductor BeAu
• Thermodynamic evidence for a pressure-driven crossover from strong- to weak-coupling superconductivity in Pb