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Oxygen stripes in La0.5Ca0.5MnO3 from ab initio calculations
V Ferrari1, M Towler, P B Littlewood
1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK.
Physical Review Letters
|December 20, 2003
Summary
This study reveals La0.5Ca0.5MnO3 perovskite exhibits a charge-ordering stripelike ground state. This complex charge-density wave involves oxygen holes coupled with manganese spin/orbital order.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Computational Physics
Background:
- La0.5Ca0.5MnO3 is a perovskite material exhibiting complex electronic and magnetic properties.
- Understanding its charge ordering and magnetic structure is crucial for materials science applications.
Purpose of the Study:
- To investigate the electronic, magnetic, and orbital properties of La0.5Ca0.5MnO3.
- To elucidate the nature of the charge-ordering stripelike ground state.
Main Methods:
- Utilized ab initio electronic structure calculations.
- Employed the Hartree-Fock approximation for theoretical analysis.
- Incorporated the experimental crystal structure from Radaelli et al. (1997).
Main Results:
- Identified a charge-ordering stripelike ground state in La0.5Ca0.5MnO3.
- Observed an insulating magnetic structure with antiferromagnetically coupled zigzag chains.
- Found agreement with neutron, X-ray, and electron diffraction experimental data.
Conclusions:
- The detailed structure is more complex than simple Mn d-level models suggest.
- The ground state is better described as a charge-density wave of oxygen holes.
- This charge-density wave is coupled to the manganese spin/orbital order.