Single-particle gap above the Verwey transition in Fe{sub 3}O{sub 4}

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.12813· OSTI ID:565333

Park, J ^[1]; Tjeng, L H ^[1]; Allen, J W ^[1]; Metcalf, P ^[2]; Chen, C T ^[3]

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1. Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109 (United States)
2. Department of Physics, Purdue University, W. Lafayette, Indiana 47907 (United States)
3. Bell Laboratories, Lucent Technology, Murray Hill, New Jersey 07974 (United States)

The Verwey transition in magnetite, Fe{sub 3}O{sub 4}, has been studied using temperature-dependent high-resolution photoemission spectroscopy. On heating through the transition temperature T{sub V} the band gap is not collapsed, but is merely reduced by {approximately}50meV, showing that a metal-insulator transition does not occur. The change in the gap is perfectly consistent with the two orders of magnitude conductivity jump at T{sub V}. Thus even above T{sub V} short-range charge ordering rather than site equivalency dominates the single-particle excitations and the electrical properties. We also point out important implications for efforts to model the electrical transport above T{sub V}. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016; FG02-90ER45416
• OSTI ID: 565333
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
IRON OXIDES
MAGNETITE
PHASE TRANSFORMATIONS
PHOTOEMISSION
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE