Garcia-Barriocanal, J., Cezar, J. C., Bruno, F. Y., Thakur, P., Brookes, N. B., Utfeld, C., Rivera-Calzada, A., Giblin, S. R., Taylor, J. W., Duffy, J. A., Dugdale, S. B., Nakamura, T., Kodama, K., Leon, C., Okamoto, S. and Santamaria, J.. (2010) Spin and orbital Ti magnetism at LaMnO3/SrTiO3 interfaces. Nature Communications, Volume 1 . Article no. 82. ISSN 2041-1723

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Abstract

In systems with strong electron-lattice coupling, such as manganites, orbital degeneracy is lifted, causing a null expectation value of the orbital magnetic moment. Magnetic structure is thus determined by spin-spin superexchange. In titanates, however, with much smaller Jahn-Teller distortions, orbital degeneracy might allow non-zero values of the orbital magnetic moment, and novel forms of ferromagnetic superexchange interaction unique to t(2g) electron systems have been theoretically predicted, although their experimental observation has remained elusive. In this paper, we report a new kind of Ti3+ ferromagnetism at LaMnO3/SrTiO3 epitaxial interfaces. It results from charge transfer to the empty conduction band of the titanate and has spin and orbital contributions evidencing the role of orbital degeneracy. The possibility of tuning magnetic alignment (ferromagnetic or antiferromagnetic) of Ti and Mn moments by structural parameters is demonstrated. This result will provide important clues for understanding the effects of orbital degeneracy in superexchange coupling.

Item Type:	Journal Article
Subjects:	Q Science
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Nature Communications
Publisher:	Nature Publishing Group
ISSN:	2041-1723
Date:	September 2010
Volume:	Volume 1
Number of Pages:	7
Page Range:	Article no. 82
Identification Number:	10.1038/ncomms1080
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Spanish Ministry of Science and Innovation (MICINN), Spanish MICINN, Materials Sciences and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy, Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	MAT 2008 06517, CSD2009-00013, CAM S2009-MAT 1756, EP/F062729 (EPSRC), EP/G056463/1 (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/4786

Data sourced from Thomson Reuters' Web of Knowledge

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