Anomalous variation of A-type antiferromagnetic order and two-dimensional ferromagnetic fluctuation in orbital-ordered La1−xEuxMnO3

C. T. Chen, B. N. Lin, Y. Y. Hsu, J. D. Liao, W. H. Cheng, C. Y. Lin, H. C. Ku, J. F. Lee, L. Y. Jang, D. G. Liu

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Abstract

A-type antiferromagnetic (AF) order with a two-dimensional (2D) ferromagnetic short-range fluctuation was observed in the stoichiometric orthorhombic La1−xEuxMnO3+δ system (0 < x < 1, δ 0 with trivalent Mn3+). The observation of strong basal plane ferromagnetic coupling of the A-type AF order with fluctuation above antiferromagnetic Néel temperature TN strongly indicates a C-type orbital ordering of eg electrons at higher temperature throughout the whole system. Anomalous decrease of TN from 139 K for LaMnO3, to 91 K for La0.5Eu0.5MnO3 and down to 42 K for EuMnO3 is the result of weaker anisotropic superexchange interaction due to stronger Jahn-Teller lattice distortion in orbital-ordered EuMnO3 from power x-ray Rietveld analysis and Mn K-edge x-ray absorption near-edge structure spectroscopic study.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number21
DOIs
Publication statusPublished - 2003 Jun 19
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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