From LaH10 to room-temperature superconductors

Abstract

Thermodynamic parameters of the $\mathrm{La}{\mathrm{H}}_{10}$ superconductor were an object of our interest. $\mathrm{La}{\mathrm{H}}_{10}$ is characterised by the highest experimentally observed value of the critical temperature: $T_C^a=215$~K ($p_a=150$~GPa) and $T_C^b=260$~K ($p_b=190$~GPa). It belongs to the group of superconductors with a~strong electron--phonon coupling (${\lambda }_a\sim 2.2$ and ${\lambda }_b\sim 2.8$). We calculated thermodynamical parameters of this superconductor and found that the values of the order parameter, the thermodynamic critical field, and the specific heat differ significantly from the values predicted by the conventional BCS theory. Due to the specific structure of the Eliashberg function for the hydrogenated compounds, the qualitative analysis suggests that the superconductors of the $\mathrm{L}{\mathrm{a}}_{\delta }{\mathrm{X}}_{1-\delta }{\mathrm{H}}_{10}$--type (LaXH--type) structure, where $\mathrm{X}\in \{\mathrm{Sc},\mathrm{Y}\}$, would exhibit significantly higher critical temperature than $T_C$ obtained for $\mathrm{La}{\mathrm{H}}_{10}$. In the case of LaScH we came to the following assessments: $T_C^a\in ⟨220,267⟩$~K and $T_C^b\in ⟨263,294⟩$~K, while the results for LaYH were: $T_C^a\in ⟨218,247⟩$~K and $T_C^b\in ⟨261,274⟩$~K.

arXiv comment6 pages, 5 figures

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• Anharmonic theory of superconductivity in the high-pressure materials
• Resistive transition of hydrogen-rich superconductors
• Resonant multigap superconductivity at room temperature near a Lifshitz topological transition in sulfur hydrides
• Quantifying the nonadiabaticity strength constant in recently discovered highly-compressed superconductors
• Ternary superhydrides under pressure of Anderson's theorem: Near-record superconductivity in (La,Sc)H${}_{12}$
• X-ray Diffraction and Electrical Transport Imaging of Superconducting Superhydride (La,Y)H10
• Carbonaceous sulfur hydride system: the strong-coupled room-temperature superconductor with a low value of Ginzburg-Landau parameter
• Analytical solution of the Eliashberg equations for strong-coupling superconductivity in hydrides