In-plane charge fluctuations in bismuth-sulfide superconductors

Anushika Athauda, Junjie Yang, Seunghun Lee, Yoshikazu Mizuguchi, Keita Deguchi, Yoshihiko Takano, Osuke Miura, Despina Louca

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59 Scopus citations

Abstract

The local atomic structure of the new nonmagnetic superconducting system LaO1-xFxBiS2 is investigated using neutron diffraction and the pair density function analysis. Evidence for local charge fluctuations linked to a charge disproportionation of the Bi ions in the distorted lattice of superconducting LaO1-xFxBiS2 is presented. In-plane short-range distortions of sulfur atoms up to 0.3 Å in magnitude break site symmetry and create two distinct environments around Bi. Out-of-plane motion of apical sulfur brings it closer to the La-O/F doping layer with increasing x that may lead to a charge transfer conduit between the doping layers and the superconducting BiS2 planes. The mechanism for superconductivity may arise from the interplay between charge density fluctuations and an enhanced spin-orbit coupling suggested theoretically that induces spin polarization.

Original languageEnglish (US)
Article number144112
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number14
DOIs
StatePublished - Apr 22 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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