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Phys. Rev. Lett. 95, 236401 (2005) [4 pages]

Orbital Polaron Lattice Formation in Lightly Doped La1-xSrxMnO3

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J. Geck1,2, P. Wochner2, S. Kiele1,3, R. Klingeler1, P. Reutler1,4, A. Revcolevschi4, and B. Büchner1
1Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
2Max-Planck-Institut für Metallforschung, Heisenberg Str. 3, 70569 Stuttgart, Germany
3Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
4Laboratoire de Physico-Chimie de l’Etat Solide, Université de Paris-Sud, 91405 Orsay Cedex, France

Received 4 November 2004; published 29 November 2005

By resonant x-ray scattering at the Mn K edge on La7/8Sr1/8MnO3, we show that an orbital polaron lattice (OPL) develops at the metal-insulator transition of this compound. This orbital reordering explains consistently the unexpected coexistence of ferromagnetic and insulating properties at low temperatures, the quadrupling of the lattice structure parallel to the MnO2 planes, and the observed polarization and azimuthal dependencies. The OPL is a clear manifestation of strong orbital-hole interactions, which play a crucial role for the colossal magnetoresistance effect and the doped manganites in general.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.236401
DOI:
10.1103/PhysRevLett.95.236401
PACS:
71.30.+h, 61.10.Eq, 64.60.Cn, 71.27.+a
 
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