Volume 85, Number 5, March 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 March 2009|
Structural effects in Mn eg orbital occupancy of manganites using the two-orbital model
Instituto de Física, Universidade Federal do Rio Grande do Sul - 91501-970 Porto Alegre, RS, Brasil
Corresponding author: firstname.lastname@example.org
Accepted: 10 February 2009
The zero-temperature ferromagnetic phase of distorted perovskite manganites at low doping is studied as a function of lattice parameters and screened ionic charges using the two-orbital model. The dependence in the Mn-O distance of the anisotropic hopping terms is calculated numerically for LaSrxMnO3. It is shown that the eg state is dominated by the type orbital. For bandwidths comparable to Hund's rule coupling we find partially spin-polarized eg bands at small doping levels, in agreement with experimental observations using Andreev reflection. We also find small but consistent results for the static Jahn-Teller distortion at small doping. The connection of our solution to electron correlation effects is discussed.
PACS: 75.47.Lx – Manganites / 75.50.Cc – Other ferromagnetic metals and alloys / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.)
© EPLA, 2009
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