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Title: Direct band gaps in multiferroic h-LuFeO{sub 3}

We measured the optical properties of epitaxial thin films of the metastable hexagonal polymorph of LuFeO{sub 3} by absorption spectroscopy, magnetic circular dichroism, and photoconductivity. Comparison with complementary electronic structure calculations reveals a 1.1 eV direct gap involving hybridized Fe 3d{sub z{sup 2}}+O 2p{sub z}→Fe d excitations at the Γ and A points, with a higher energy direct gap at 2.0 eV. Both charge gaps nicely overlap the solar spectrum.
Authors:
; ;  [1] ;  [2] ; ; ;  [3] ;  [1] ;  [4] ;  [5] ;  [2] ;  [4]
  1. Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996 (United States)
  2. Department of Material Science and Engineering, Cornell University, Ithaca, New York 14853 (United States)
  3. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853 (United States)
  4. (United States)
  5. National High Magnetic Field Laboratory, Tallahassee, Florida 32310 (United States)
Publication Date:
OSTI Identifier:
22412710
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; COMPARATIVE EVALUATIONS; ELECTRONIC STRUCTURE; ENERGY GAP; EPITAXY; EV RANGE; EXCITATION; FERRITES; LUTETIUM COMPOUNDS; MAGNETIC CIRCULAR DICHROISM; OPTICAL PROPERTIES; PHOTOCONDUCTIVITY; THIN FILMS