Weak phonon-mediated pairing in BiS${}_2$ superconductor from first principles

Abstract

Superconductivity in novel bismuth-sulphur superconductors has attracted large research efforts, both experimental and theoretical, but a consensus on the nature of superconductivity in these materials has yet to be reached. Using density functional theory for superconductors, we study the electron-phonon pairing mechanism in LaO${}_{0.5}$F${}_{0.5}$BiS${}_2$. We first confirm the presence of a commensurate charge density wave instability, in accordance with previous studies. Using a recently developed integration scheme for the electron-phonon coupling, we found that its strength is much lower than previously calculated, due to improved density of state calculations. We finally conclude that conventional phonon-mediated pairing cannot explain the high superconducting transition temperatures observed in this material.

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• Indication of unconventional superconductivity in layered bismuth chalcogenide superconductor LaO0.6F0.4Bi(S,Se)2 revealed by Se isotope effect
• Anisotropic two-gap superconductivity and the absence of a Pauli paramagnetic limit in single-crystalline LaO${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Prediction of the High Thermoelectric Performance of Pnictogen Dichalcogenide Layered Compounds with Quasi-One-Dimensional Gapped Dirac-like Band Dispersion
• Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6
• Two-Fold-Symmetric Magnetoresistance in Single Crystals of Tetragonal BiCh2-Based Superconductor LaO0.5F0.5BiSSe
• Charge/quadrupole fluctuations and gap anisotropy in BiS${}_2$-based superconductors
• Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3
• Bulk Superconductivity Induced by Se Substitution in BiCh2-Based Layered Compounds Eu0.5Ce0.5FBiS2-xSex
• Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal
• Transition Temperature of Superconductivity in Sodium Tungsten Bronze -Theoretical Study Based on First-principles Calculations-
• Superconductivity in La1-xCexOBiSSe: carrier doping by mixed valence of Ce ions
• Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors
• Direct Observation of an Incommensurate Charge Density Wave in the BiS2-based Superconductor NdO1-xFxBiS2
• Impurity Effects in Nodal Extended $s$- and Nodeless $d$-Wave Superconductors: Gap Symmetry of BiS${}_2$-Based Layered Superconductors
• Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
• Spin-orbit coupling, minimal model and potential Cooper-pairing from repulsion in BiS${}_2$-superconductors
• High pressure effects on La(O,F)BiS${}_2$ single crystal using diamond anvil cell with dual-probe diamond electrodes
• Pressure-induced superconductivity in layered pnictogen diselenide NdO${}_{0.8}$F${}_{0.2}$Sb${}_{1-x}$Bi${}_x$Se${}_2$ (x = 0.3 and 0.7)
• Bulk superconductivity induced by Se substitution in self-doped BiCh2-based compound CeOBiS2-xSex
• Evolution of two bulk-superconducting phases in Sr0.5RE0.5FBiS2 (RE: La, Ce, Pr, Nd, Sm) by external hydrostatic pressure effect