Electron and phonon band-structure calculations for the antipolar SrPt${}_3$P antiperovskite superconductor: Evidence of low-energy two-dimensional phonons

Abstract

SrPt3P has recently been reported to exhibit superconductivity with Tc = 8.4 K. To explore its superconducting mechanism, we have performed electron and phonon band calculations based on the density functional theory, and found that the superconductivity in SrPt3P is well described by the strong coupling phonon-mediated mechanism. We have demonstrated that superconducting charge carriers come from pdπ-hybridized bands between Pt and P ions, which couple to low energy (~ 5 meV) phonon modes confined on the ab in-plane. These in-plane phonon modes, which do not break antipolar nature of SrPt3P, enhance both the electron-phonon coupling constant λand the critical temperature Tc. There is no hint of a specific phonon softening feature in the phonon dispersion, and the effect of the spin-orbit coupling on the superconductivity is found to be negligible.

5 pages, 5 figures, 1 table

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Cited by in corpus (12)

• SrPt${}_3$P: two-band single-gap superconductor
• High pressure crystal growth of the antiperovskite centrosymmetric superconductor SrPt3P
• Lattice dynamical properties of superconducting SrPt${}_3$P studied via inelastic x-ray scattering and density functional perturbation theory
• The effects of electron correlation and spin-orbit coupling in the isovalent Pd-doped superconductor SrPt${}_3$P
• High-pressure and doping studies of the superconducting antiperovskite SrPt3P
• Antiferromagnetic Kondo lattice compound CePt${}_3$P
• Pairing of weakly correlated electrons in the platinum-based centrosymmetric superconductor SrPt3P
• Influence of electron-phonon coupling strength on signatures of even and odd-frequency superconductivity
• Superconductivity of centrosymmetric and non-centrosymmetric phases in antiperovskite (Ca,Sr)Pd${}_3$P
• Electronic Structures and Phonon Spectra in Boronitride Superconductors LaMBN (M= Ni, Pt)
• Andreev-reflection spectroscopy of SrPt3P single crystals
• Possible unconventional order parameter in single crystals of SrPt${}_3$P superconductor