Crystal structure determination under high pressure in the iron-based ladder superconductor BaFe2S3

Kensuke Kobayashi, Sachiko Maki, Youichi Murakami, Yasuyuki Hirata, Kenya Ohgushi, Jun Ichi Yamaura

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The crystal structure of BaFe2S3 is determined up to ∼12 GPa by means of x-ray powder diffraction experiments using synchrotron radiation at room temperature. BaFe2S3 is the first superconductor in iron-based ladder compounds, showing the critical temperature at T c = 24 K under 11.6 GPa. The superconductivity emerges on the application of pressure after suppressing an antiferromagnetic Mott insulating state. The atomic positions in the superconducting state remain hitherto unknown experimentally. We found significant changes of structural parameters: shrinkage of the Fe-ladder unit and decreasing height of the S atom position from the Fe plane. Moreover, a reduction of the S-S distance between the ladders was observed under pressure. The pressure dependence of the structural parameters is strikingly different from the prediction of the band calculation.

Original languageEnglish
Article number105002
JournalSuperconductor Science and Technology
Volume31
Issue number10
DOIs
Publication statusPublished - 2018 Aug 28

Keywords

  • high pressure
  • iron-based ladder
  • structure determination
  • superconductor

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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