Charge fluctuations in the ndo1−xFxBiS2 superconductors

Anushika Athauda; Yoshikazu Mizuguchi; Masanori Nagao; Joerg Neuefeind; Despina Louca

doi:10.7566/JPSJ.86.124718

Charge fluctuations in the ndo_1−xF_xBiS₂ superconductors

Anushika Athauda, Yoshikazu Mizuguchi, Masanori Nagao, Joerg Neuefeind, Despina Louca

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Abstract

The local atomic structure of superconducting NdO₁−_xF_xBiS₂ (x = 0.2 and 0.4) is investigated using neutron diffraction and the pair density function analysis technique. In the non-superconducting x = 0.2 composition, ferrodistortive displacements of the pyramidal sulfur ions break the tetragonal symmetry and a superlattice structure emerges with peaks appearing at h + k odd reflections superimposed on the even reflections of the P4=nmm symmetry. In the superconducting x = 0.4 composition, similar ferrodistortive displacements are observed but with different magnitudes coupled with in-plane Bi distortions which are indicative of charge fluctuations.

Original language	English
Article number	124718
Journal	Journal of the Physical Society of Japan
Volume	86
Issue number	12
DOIs	https://doi.org/10.7566/JPSJ.86.124718
State	Published - Dec 15 2017

Funding

Acknowledgment The authors would like to thank Chunruo Duan for help with the data collection and reduction process. This work has been supported by the National Science Foundation, Grant No. DMR-1404994. Work at ORNL was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division and Scientific User Facilities Division. The authors would like to thank Chunruo Duan for help with the data collection and reduction process. This work has been supported by the National Science Foundation, Grant No. DMR-1404994. Work at ORNL was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division and Scientific User Facilities Division.

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abstract = "The local atomic structure of superconducting NdO1−xFxBiS2 (x = 0.2 and 0.4) is investigated using neutron diffraction and the pair density function analysis technique. In the non-superconducting x = 0.2 composition, ferrodistortive displacements of the pyramidal sulfur ions break the tetragonal symmetry and a superlattice structure emerges with peaks appearing at h + k odd reflections superimposed on the even reflections of the P4=nmm symmetry. In the superconducting x = 0.4 composition, similar ferrodistortive displacements are observed but with different magnitudes coupled with in-plane Bi distortions which are indicative of charge fluctuations.",

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AU - Louca, Despina

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AB - The local atomic structure of superconducting NdO1−xFxBiS2 (x = 0.2 and 0.4) is investigated using neutron diffraction and the pair density function analysis technique. In the non-superconducting x = 0.2 composition, ferrodistortive displacements of the pyramidal sulfur ions break the tetragonal symmetry and a superlattice structure emerges with peaks appearing at h + k odd reflections superimposed on the even reflections of the P4=nmm symmetry. In the superconducting x = 0.4 composition, similar ferrodistortive displacements are observed but with different magnitudes coupled with in-plane Bi distortions which are indicative of charge fluctuations.

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Charge fluctuations in the ndo_1−xF_xBiS₂ superconductors

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