Disorder-induced orbital ordering in doped manganites

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Kumar, Sanjeev and Kampf, Arno P. (2008) Disorder-induced orbital ordering in doped manganites. Physical Review B: Condensed matter and materials physics, 77 (13). p. 134442. ISSN 1098-0121

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Abstract:We study the effect of quenched disorder on the ordering of orbital and magnetic degrees of freedom in a two-dimensional, two-band double-exchange model for eg electrons coupled to Jahn–Teller distortions. By using a real-space Monte Carlo method, we find that disorder can induce a short-range ordering of the orbital degrees of freedom near 30% hole doping. The most striking consequence of this short-range ordering is a strong increase in the low-temperature resistivity. The real-space approach allows us to analyze the spatial patterns of the charge, orbital, and magnetic degrees of freedom and the correlations among them. The magnetism is inhomogeneous on the nanoscale in the short-range orbitally ordered state.
Item Type:Article
Copyright:© 2008 American Physical Society
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Link to this item:http://purl.utwente.nl/publications/59252
Official URL:http://dx.doi.org/10.1103/PhysRevB.77.134442
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