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CBED Study of Mn3+ Orbital Ordering in LaMnO3

Published online by Cambridge University Press:  02 July 2020

B. Jiang ,
J.M. Zuo ,
Q. Chen ,
S-W Cheong  and
J.C.H. Spence
B. Jiang
Affiliation:
Department of Physics & Astronomy, Arizona State University, Tempe, AZ85287
J.M. Zuo
Affiliation:
Department of Physics & Astronomy, Arizona State University, Tempe, AZ85287
Q. Chen
Affiliation:
Department of Physics & Astronomy, Arizona State University, Tempe, AZ85287
S-W Cheong
Affiliation:
Lucent Technologies, Murray Hill, New Jersey, 07974
J.C.H. Spence
Affiliation:
Department of Physics & Astronomy, Arizona State University, Tempe, AZ85287
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Mn oxides of pervoskite-related structure containing Mn ions have attracted considerable interest due to the colossal magnetoresistence (CMR) effect. Doping the family of compounds La1-x Cax MnO3 with divalent Ca ion oxidizes Mn+3 to Mn4+, introducing holes in the 3d bond orbital that give rise to a series of interesting physical properties. The parent compound LaMnO3 (Pbnm) with unit cell of a=5.5367Å b=5.7473Å and c=7.6929Å, is an antiferromagnetic insulator in which orbital ordering is established due to the cooperative Jahn-Teller (JT) effect breaking the degeneracy of the electronic configuration of Mn3+ (t2g3eg1). This particular C-type orbital ordering is responsible for the A-type magnetic structure observed by Wollen and Kohler. Theoretical Monte-Carlo simulation has shown that the A-type antiferromagnetic state is stable in a model based on JT phonons, using coupling values physically reasonable for LaMnO3 and considering the small but important effect of octahedral tilting.

Type
Sir John Meurig Thomas Symposium: Microscopy and Microanalysis in the Chemical Sciences
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 46 - 47
Copyright
Copyright © Microscopy Society of America

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