Charge Density Wave Instability and Soft Phonon in $A$Pt${}_3$P ($A$=Ca, Sr, and La)

Abstract

The electronic and phonon properties of the platinum pnictide superconductors $A$Pt${}_3$P ($A$=Ca, Sr, and La) were studied using first-principles calculations. The spin-orbit coupling effect is significant in LaPt${}_3$P but negligible in CaPt${}_3$P and SrPt${}_3$P, although they all share the same anti-pevroskite structure. Moreover, SrPt${}_3$P has been demonstrated to exhibit an unexpected weak charge-density-wave(CDW) instability which is neither simply related to the Fermi-surface nesting nor to the momentum-dependent electron-phonon coupling alone. The instability is absent in CaPt${}_3$P and can be quickly suppressed by the external pressure, accompanied with gradual decreases in the phonon softening and BCS $T_c$. Our results suggest SrPt${}_3$P as a rare example where superconductivity is enhanced by the CDW fluctuations.

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Cited by in corpus (16)

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• Rational design principles for giant spin Hall effect in 5d-transition metal oxides
• Chiral singlet superconductivity in the weakly correlated metal LaPt3P
• SrPt${}_3$P: two-band single-gap superconductor
• Evidence for two energy gaps and Fermi liquid behavior in SrPt${}_2$As${}_2$ superconductor
• Electron and phonon band-structure calculations for the antipolar SrPt${}_3$P antiperovskite superconductor: Evidence of low-energy two-dimensional phonons
• 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
• Structural phase transitions and superconductivity in the Heusler intermetallics $X$Pd${}_2$Sn ($X$ = Ti, Zr, Hf)
• Possible unconventional order parameter in single crystals of SrPt${}_3$P superconductor