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Pressure‐Induced Metallization of the Perovskite Sr 3 Fe 2 O 7
Author(s) -
Rozenberg G.Kh.,
Machavariani G.Yu.,
Pasternak M. P.,
Milner A. P.,
Hearne G. R.,
Taylor R. D.,
Adler P.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199901)211:1<351::aid-pssb351>3.0.co;2-7
Subject(s) - antiferromagnetism , condensed matter physics , diamond anvil cell , materials science , semiconductor , metal , metal–insulator transition , perovskite (structure) , diffraction , structural change , mössbauer spectroscopy , crystallography , chemistry , physics , economics , optoelectronics , optics , metallurgy , macroeconomics
Electrical, magnetic and structural properties of the antiferromagnetic semiconductor Sr 3 Fe 2 O 7 (Fe 4+ , d 4 ) 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 strontium ferrates is discussed.