Electronic Structure of New Multiple Band Pt-Pnictide Superconductors APt3P

Abstract

We report LDA calculated band structure, densities of states and Fermi surfaces for recently discovered Pt-pnictide superconductors APt3P (A=Ca,Sr,La), confirming their multiple band nature. Electronic structure is essentially three dimensional, in contrast to Fe pnictides and chalcogenides. LDA calculated Sommerfeld coefficient agrees rather well with experimental data, leaving little space for very strong coupling superconductivity, suggested by experimental data on specific heat of SrPt3P. Elementary estimates show, that the values of critical temperature can be explained by rather weak or moderately strong coupling, while the decrease of superconducting transition temperature Tc from Sr to La compound can be explained by corresponding decrease of total density of states at the Fermi level N(E_F). The shape of the density of states near the Fermi level suggests that in SrPt3P electron doping (such as replacement Sr by La) decreases N(E_F) and Tc, while hole doping (e.g. partial replacement of Sr with K, Rb or Cs, if possible) would increase N(E_F) and possibly Tc.

5 pages, 5 figures

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Cited by in corpus (11)

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• SrPt${}_3$P: two-band single-gap superconductor
• High pressure crystal growth of the antiperovskite centrosymmetric superconductor SrPt3P
• Electronic structure of iron-based superconductors: from pnictides to chalcogenides and other similar systems
• 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
• Influence of electron-phonon coupling strength on signatures of even and odd-frequency superconductivity
• Comparative Study of Electronic structure of New Superconductors (Sr,Ca)Pd2As2 and related compound BaPd2As2
• Superconductivity of centrosymmetric and non-centrosymmetric phases in antiperovskite (Ca,Sr)Pd${}_3$P
• Possible unconventional order parameter in single crystals of SrPt${}_3$P superconductor