Ferro-lattice-distortions and charge fluctuations in superconducting LaO1-xFxBiS2

Anushika Athauda; Christina Hoffmann; Saicharan Aswartham; Jasminka Terzic; Gang Cao; Xiangde Zhu; Yang Ren; Despina Louca

doi:10.7566/JPSJ.86.054701

Ferro-lattice-distortions and charge fluctuations in superconducting LaO_1-xF_xBiS₂

Anushika Athauda, Christina Hoffmann, Saicharan Aswartham, Jasminka Terzic, Gang Cao, Xiangde Zhu, Yang Ren, Despina Louca

Single Crystal Diffraction

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

12 Scopus citations

Abstract

Competing ferroelectric and charge density wave states have been proposed to exist in the electron-phonon coupled LaO_1-xF_xBiS₂ superconductor. The lattice instability is proposed to arise from unstable phonon modes that can break the crystal symmetry. Using single crystal diffraction, a superlattice pattern is observed, that arises from coherent in-plane displacements of the sulfur atoms in the BiS₂ superconducting planes. The distortions morph into coordinated ferrodistortive patterns with displacements in the x- and y-directions, that alternate along the c-axis. Diffuse scattering is observed along the (H0L) plane due to stacking faults but not along the (HH0) plane. The ferro-distortive pattern remains in the superconducting state upon fluorine doping, but the displacements are diminished in magnitude. Moreover, we find that the in-plane distortions give rise to disorder where the (00L) reflections become quite broad. It is possible that charge carriers can get trapped in the lattice deformations reducing the effective number of carriers available for pairing.

Original language	English
Article number	054701
Journal	Journal of the Physical Society of Japan
Volume	86
Issue number	5
DOIs	https://doi.org/10.7566/JPSJ.86.054701
State	Published - May 15 2017

Funding

The authors would like to acknowledge support from the National Science Foundation, DMR-1404994, 1265162, and 1334170. Work at ORNL was supported by the US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division and Scientific User Facilities Division. Work at the Advanced Photon Source, was supported by the US Department of Energy, Office of Science User Facility, and operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

Funders	Funder number
Materials Sciences and Engineering Division and Scientific User Facilities Division
National Science Foundation	DMR-1404994
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1404994, 1265162, 1334170
Office of Science
Basic Energy Sciences
Argonne National Laboratory	DE-AC02-06CH11357

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title = "Ferro-lattice-distortions and charge fluctuations in superconducting LaO1-xFxBiS2",

abstract = "Competing ferroelectric and charge density wave states have been proposed to exist in the electron-phonon coupled LaO1-xFxBiS2 superconductor. The lattice instability is proposed to arise from unstable phonon modes that can break the crystal symmetry. Using single crystal diffraction, a superlattice pattern is observed, that arises from coherent in-plane displacements of the sulfur atoms in the BiS2 superconducting planes. The distortions morph into coordinated ferrodistortive patterns with displacements in the x- and y-directions, that alternate along the c-axis. Diffuse scattering is observed along the (H0L) plane due to stacking faults but not along the (HH0) plane. The ferro-distortive pattern remains in the superconducting state upon fluorine doping, but the displacements are diminished in magnitude. Moreover, we find that the in-plane distortions give rise to disorder where the (00L) reflections become quite broad. It is possible that charge carriers can get trapped in the lattice deformations reducing the effective number of carriers available for pairing.",

author = "Anushika Athauda and Christina Hoffmann and Saicharan Aswartham and Jasminka Terzic and Gang Cao and Xiangde Zhu and Yang Ren and Despina Louca",

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AU - Athauda, Anushika

AU - Hoffmann, Christina

AU - Aswartham, Saicharan

AU - Terzic, Jasminka

AU - Cao, Gang

AU - Zhu, Xiangde

AU - Ren, Yang

AU - Louca, Despina

PY - 2017/5/15

Y1 - 2017/5/15

N2 - Competing ferroelectric and charge density wave states have been proposed to exist in the electron-phonon coupled LaO1-xFxBiS2 superconductor. The lattice instability is proposed to arise from unstable phonon modes that can break the crystal symmetry. Using single crystal diffraction, a superlattice pattern is observed, that arises from coherent in-plane displacements of the sulfur atoms in the BiS2 superconducting planes. The distortions morph into coordinated ferrodistortive patterns with displacements in the x- and y-directions, that alternate along the c-axis. Diffuse scattering is observed along the (H0L) plane due to stacking faults but not along the (HH0) plane. The ferro-distortive pattern remains in the superconducting state upon fluorine doping, but the displacements are diminished in magnitude. Moreover, we find that the in-plane distortions give rise to disorder where the (00L) reflections become quite broad. It is possible that charge carriers can get trapped in the lattice deformations reducing the effective number of carriers available for pairing.

AB - Competing ferroelectric and charge density wave states have been proposed to exist in the electron-phonon coupled LaO1-xFxBiS2 superconductor. The lattice instability is proposed to arise from unstable phonon modes that can break the crystal symmetry. Using single crystal diffraction, a superlattice pattern is observed, that arises from coherent in-plane displacements of the sulfur atoms in the BiS2 superconducting planes. The distortions morph into coordinated ferrodistortive patterns with displacements in the x- and y-directions, that alternate along the c-axis. Diffuse scattering is observed along the (H0L) plane due to stacking faults but not along the (HH0) plane. The ferro-distortive pattern remains in the superconducting state upon fluorine doping, but the displacements are diminished in magnitude. Moreover, we find that the in-plane distortions give rise to disorder where the (00L) reflections become quite broad. It is possible that charge carriers can get trapped in the lattice deformations reducing the effective number of carriers available for pairing.

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Ferro-lattice-distortions and charge fluctuations in superconducting LaO_1-xF_xBiS₂

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