Disorder-induced orbital ordering in doped manganites

S. Kumar, Arno P. Kampf

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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.
Original languageUndefined
Pages (from-to)134442/1-134442/7
Number of pages7
JournalPhysical review B: Condensed matter and materials physics
Volume77
Issue number13
DOIs
Publication statusPublished - 2008

Keywords

  • METIS-253413
  • IR-59252

Cite this

Kumar, S. ; Kampf, Arno P. / Disorder-induced orbital ordering in doped manganites. In: Physical review B: Condensed matter and materials physics. 2008 ; Vol. 77, No. 13. pp. 134442/1-134442/7.
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Disorder-induced orbital ordering in doped manganites. / Kumar, S.; Kampf, Arno P.

In: Physical review B: Condensed matter and materials physics, Vol. 77, No. 13, 2008, p. 134442/1-134442/7.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Kumar, S.

AU - Kampf, Arno P.

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N2 - 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.

AB - 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.

KW - METIS-253413

KW - IR-59252

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DO - 10.1103/PhysRevB.77.134442

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