Issue |
Europhys. Lett.
Volume 65, Number 2, January 2004
|
|
---|---|---|
Page(s) | 262 - 268 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-10067-5 | |
Published online | 01 January 2004 |
Magnetic and orbital order in overdoped bilayer manganites
1
Max-Planck-Institut für Physik Komplexer Systeme Nöthnitzer Str. 38, 01187 Dresden, Germany
2
Department of Physics & Meteorology and Centre for Theoretical Studies Indian Institute of Technology - Kharagpur 721302, India
3
The Abdus Salam International Centre for Theoretical Physics Strada Costiera 11, 34014 Trieste, Italy
Corresponding authors: tulika@mpipks-dresden.mpg.de arghya@phy.iitkgp.ernet.in
Received:
20
August
2003
Accepted:
6
November
2003
The magnetic and orbital orders for the bilayer manganites in the
doping region have been investigated from a model
that incorporates the two eg orbitals at each
site, the inter-orbital Coulomb interaction and lattice
distortions. The usual double exchange operates via the eg
orbitals. It is shown that such a model reproduces much of the
phase diagram recently obtained for the bilayer systems in this
range of doping. The C-type phase with (
) spin order
seen by Ling et al. appears as a natural consequence of the
layered geometry and is stabilised by the static distortions of
the system. The orbital order is shown to drive the magnetic order
while the anisotropic hopping across the eg orbitals, the layered
nature of the underlying structure and the associated static
distortions largely determine the orbital arrangements.
PACS: 75.47.Gk – Colossal magnetoresistance / 75.30.Et – Exchange and superexchange interactions
© EDP Sciences, 2004
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