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Optical transitions in non-stoichiometric LaMnO3 identifying the charge-transfer transitions

Kovaleva, NN; Gavartin, JL; Boris, AV; Stoneham, AM; (2002) Optical transitions in non-stoichiometric LaMnO3 identifying the charge-transfer transitions. Physica B: Condensed Matter , 312-31 737 - 739. 10.1016/S0921-4526(01)01204-2. Green open access

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Abstract

Using the Mott-Littleton approach we examine the energies of a number of fundamental optical transitions, as well as those involving self-trapped holes of Mn4+ and O- in LaMnO3 lattice. The reasonable agreement with the experiment of our predicted energies, linewidths and oscillator strengths leads us to plausible assignments of the optical bands observed. We deduce that the optical band near 5 eV is associated with O(2p)-Mn(3d) transition of charge-transfer character, whereas the band near 2.3 eV is rather associated with the presence of Mn4+ and/or O- self-trapped holes in the as-grown non-stoichiometric LaMnO3 compound. We do not exclude other contributions to the latter band. (C) 2002 Elsevier Science B.V. All rights reserved.

Type: Article
Title: Optical transitions in non-stoichiometric LaMnO3 identifying the charge-transfer transitions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/S0921-4526(01)01204-2
Publisher version: http://dx.doi.org/10.1016/S0921-4526(01)01204-2
Language: English
Additional information: Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012
Keywords: Colossal magneto resistance (CMR), optical conductivity, charge-transfer (CT) transitions
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/97055
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