Magnetic-Electronic, Conductivity, and Structural Pressure Studies of Sr2FeO4 and Sr3Fe2O7

G. Kh Rozenberg, M. P. Pasternak, A. P. Milner, M. Amanowicz, G. R. Hearne, K. E. Brister, P. Adler

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Sr2FeO4 and Sr3Fe2O7 have been investigated by resistance-temperature, 57Fe-Mössbauer magnetic and x-ray diffraction studies up to ~30 GPa. Magnetic moments in Sr2FeO4 remain intact across the conductivity transition to a metallic state at -17 GPa. The complex spiral-type magnetic structure at low pressure changes to collinear in the metallic state. In Sr3Fe2O7 the original disproportionated state and associated magnetic-electronic structure first exhibits a change at ~1215 GPa, and only a single valence state is discernible at P ≥ 21 GPa. A very narrow gapped state prevalent at ~10 GPa undergoes a sluggish transition to incipient metallic behavior at ~28 GPa. X-ray data suggest that the magnetic-electronic and conductivity transitions in both compounds are not driven by symmetry-lowering structural transitions, [high pressure, Mossbauer spectroscopy, x-ray diffraction, semiconductor-metal transition, disproportionation].

Original languageEnglish (US)
Pages (from-to)653-655
Number of pages3
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume7
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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