In-plane charge fluctuations in bismuth-sulfide superconductors

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

doi:10.1103/PhysRevB.91.144112

In-plane charge fluctuations in bismuth-sulfide superconductors

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

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

The local atomic structure of the new nonmagnetic superconducting system LaO_1-xF_xBiS₂ 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 LaO_1-xF_xBiS₂ 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 language	English (US)
Article number	144112
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	91
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.91.144112
State	Published - Apr 22 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.91.144112

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title = "In-plane charge fluctuations in bismuth-sulfide superconductors",

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 {\AA} 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.",

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

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AU - Athauda, Anushika

AU - Yang, Junjie

AU - Lee, Seunghun

AU - Mizuguchi, Yoshikazu

AU - Deguchi, Keita

AU - Takano, Yoshihiko

AU - Miura, Osuke

AU - Louca, Despina

PY - 2015/4/22

Y1 - 2015/4/22

N2 - 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.

AB - 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.

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In-plane charge fluctuations in bismuth-sulfide superconductors

Abstract

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