Minimum model and its theoretical analysis for superconducting materials with BiS${}_2$ layers

Abstract

We perform first principles band calculation of the newly discovered superconductor LaO${}_{1-x}$F${}_x$BiS${}_2$, and study the lattice structure and the fluorine doping dependence of the gap between the valence and conduction bands. We find that the distance between La and S as well as the fluorine doping significantly affects the band gap. On the other hand, the four orbital model of the BiS${}_2$ layer shows that the lattice structure does not affect this portion of the band. Still, the band gap can affect the carrier concentration in the case of light electron doping, which in turn should affect the transport properties.

submitted as Proc. ISS2012, 4 pages, 4 figures

References in corpus (5)

• Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
• Novel BiS2-based layered superconductor Bi4O4S3
• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Minimal electronic models for superconducting BiS${}_2$ layers
• Pressure Study of BiS2-Based Superconductors Bi4O4S3 and La(O,F)BiS2

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• Evolution of superconductivity in BiS2-based superocnductor LaO0.5F0.5Bi(S1-xSex)2
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• Fermi-Surface Topology and Pairing Symmetry in BiS${}_2$-Based Layered Superconductors
• Enhancement of Tc in BiS2 based superconductors NdO0.7F0.3BiS2 by substitution of Pb for Bi
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• Upper critical magnetic field of $Ln$O${}_{0.5}$F${}_{0.5}$BiS${}_2$ ($Ln$ = La, Nd) superconductors at ambient and high pressure
• 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
• Element Substitution Effect on Superconductivity in BiS2-Based NdO_{1-x}F_xBiS_2
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