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Title: Room temperature optical anisotropy of a LaMnO{sub 3} thin-film induced by ultra-short pulse laser

We observed ultra-short laser pulse-induced transient optical anisotropy in a LaMnO{sub 3} thin film. The anisotropy was induced by laser pulse irradiation with a fluence of less than 0.1 mJ/cm{sup 2} at room temperature. The transmittance and reflectance showed strong dependence on the polarization states of the pulses. For parallel and perpendicular polarization states, there exists a difference of approximately 0.2% for transmittance and 0.05% for reflectance at 0.3 ps after the irradiation with a pump pulse, respectively. The theoretical values for optical transmittance and reflectance with an assumption of an orbital ordering of 3d e{sub g} electrons in Mn{sup 3+} ions showed good agreement with the experimental results, demonstrating that the transient optical anisotropy in LaMnO{sub 3} thin film is due to the photo-induced symmetry-breaking of orbital ordering in excited states.
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Department of Physics and IPIT, Chonbuk National University, Jeonju 561-756 (Korea, Republic of)
  2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  3. Department of Geophysics, National University of Mongolia, Ulaanbaatar 210646 (Mongolia)
  4. Department of Physics, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
  5. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
  6. Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561 (Japan)
  7. Department of Applied Physics, Stanford University, Stanford, California 94305-4045 (United States)
Publication Date:
OSTI Identifier:
22412765
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 9; 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; ANISOTROPY; APPROXIMATIONS; ELECTRONS; EXCITED STATES; LANTHANUM COMPOUNDS; LASER RADIATION; MANGANATES; MANGANESE IONS; POLARIZATION; PULSED IRRADIATION; SYMMETRY BREAKING; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TRANSIENTS