Ferrodistortive instability at the (001) surface of half-metallic manganites
Pruneda, Miguel (University of California. Department of Physics)
Ferrari, Valeria P. (University of Cambridge. Cavendish Laboratory)
Rurali, Riccardo (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Littlewood, Peter (University of Cambridge. Cavendish Laboratory)
Spaldin, Nicola A. (University of California. Materials Department)
Artacho, Emilio (University of Cambridge. Department of Earth Sciences)
American Physical Society

Data:	2007
Resum:	We present the structure of the fully relaxed (001) surface of the half-metallic manganite La0. 7Sr0. 3MnO3, calculated using density functional theory. Two relevant ferroelastic order parameters are identified and characterized. The known tilting of the oxygen octahedra, which is present in the bulk phase, decreases towards the surface. A ferrodistortive Mn off-centering, triggered by the surface and not reported before, decays monotonically into the bulk. This distortion affects neither the half-metallicity nor the zero-temperature magnetization, but does change the effective spin-spin interactions, and thus the temperature dependence of the magnetic properties.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; Versió publicada
Publicat a:	Physical review letters, Vol. 99, Issue 22 (November 2007) , p. 226101, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.99.226101

4 p, 962.7 KB

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