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Spin and orbital Ti magnetism at LaMnO3/SrTiO3 interfaces
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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. doi:10.1038/ncomms1080 ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/ncomms1080
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, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Nature Communications | ||||
| Publisher: | Nature Publishing Group | ||||
| ISSN: | 2041-1723 | ||||
| Official Date: | September 2010 | ||||
| Dates: |
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| Volume: | Volume 1 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | Article no. 82 | ||||
| DOI: | 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) |
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