Pressure-induced metallization of the perovskite Sr3Fe2O7

G. Kh Rozenberg, G. Yu Machavariani, M. P. Pasternak, A. P. Milner, G. R. Hearne, R. D. Taylor, P. Adler

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Electrical, magnetic and structural properties of the antiferromagnetic semiconductor Sr3Fe2O7 (Fe4+, d4 ) were probed by resistance, Mössbauer spectroscopy (MS) and X-ray diffraction (XRD) measurements up to P ≈ 40 GPa using diamond-anvil cells. A sluggish pressure-induced insulator-metal (IM) transition is observed with a clear incipient metallic state at P ≥ 20 GPa. The Fe(IV) 3d magnetic moments remain unaltered across the transition as deduced from MS, and XRD studies show no structural symmetry change up to 40 GPa. The results are consistent with carrier delocalization due to p-p gap closure, e.g., ligand-to-ligand charge transfer that does not involve the d-states and structural symmetry changes. A mechanism to account for the IM transition in the stronlium ferrates is discussed.

Original languageEnglish
Pages (from-to)351-357
Number of pages7
JournalPhysica Status Solidi (B): Basic Research
Issue number1
Publication statusPublished - Jan 1999
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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