Journal Article

PreJuSER-29882

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Polaronic orbital polarization in a layered colossal magnetoresistive manganite

Campbell, B. J. ; Sinha, S. K. ; Osborn, R. ; Rosenkranz, S. ; Mitchell, J. F. ; Argyriou, D. N. ; Vasiliu-Doloc, L. ; Seeck, O.FZJ* ; Lynn, J. W.

2003
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/1318  doi:10.1103/PhysRevB.67.020409

Abstract: The striking anisotropy observed in Huang scattering distributions near the intense Bragg reflections of La1.2Sr1.8Mn2O7 is shown to be the result of orbitally polarized polarons in the paramagnetic insulating state above T-C. X-ray single-crystal diffuse scattering patterns from this bilayered colossal magnetoresistive manganite are calculated in terms of the polaronic local structure and compared with experimental measurements. At 300 K, the polaronic e(g) electrons occupy "out-of-plane" (i.e., 3z(2)-r(2)) orbitals, leading to MnO6 octahedra that are Jahn-Teller elongated along the c axis, perpendicular to the perovskite layers. Between 300 K and T-C, however, the "orbital polarization" is shown to shift into the a-b plane (i.e., 3x(2)-r(2) and 3y(2)-r(2) orbitals), allowing the formation of nanoscale polaron correlations above T-C.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Streumethoden (IFF-STM)

Research Program(s):

1. Kondensierte Materie (M02)

Appears in the scientific report 2003
Notes: This version is available at the following Publisher URL: http://prb.aps.org

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