National Tsing Hua University Institutional Repository:A-type antiferromagnetic order, 2D ferromagnetic fluctuation and orbital order in stoichiometric la1-xEuxMnO3
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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 期刊論文 >  A-type antiferromagnetic order, 2D ferromagnetic fluctuation and orbital order in stoichiometric la1-xEuxMnO3


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    题名: A-type antiferromagnetic order, 2D ferromagnetic fluctuation and orbital order in stoichiometric la1-xEuxMnO3
    作者: Ku, H.C.;Chen, C.T.;Lin, B.N.
    教師: 古煥球
    日期: 2004
    出版者: Elsevier
    關聯: Journal of Magnetism and Magnetic Materials, Elsevier, Volumes 272-276, Part 1, May 2004, Pages 85-87
    关键词: Stoichiometry
    Antiferromagnetism
    Lanthanum compounds
    Spectroscopic analysis
    Thermal effects
    Electrons
    Magnetic anisotropy
    摘要: Magnetic, structural and Mn K-edge X-ray absorption near-edge structure (XANES) spectroscopic studies have been made on the stoichiometric Lai 1-xEuxMnO3 (0 [less-than or equal to] x [less-than or equal to] 1) system with trivalent Mn3+. The system undergoes an A-type antiferromagnetic (AF) order with Neel temperature TN ranging from 139 K for LaMnO3 to 42 K for smaller EuMnO3, above which a two-dimensional ferromagnetic (2D-FM) short range fluctuation prevails with T2D > TN at low applied field. This is the result of anisotropic superexchange interaction for the A-type AF order with strong basal plane FM coupling of the orbital-ordered eg electrons and weak c-axis AF coupling of t2g electrons. The anomalous decrease of TN with increasing smaller Eu substitution is due to more localized t2g electrons from a stronger crystal field splitting and lattice distortion in the MnO6 octahedron. Both T2D and TN are field dependent and nearly merge at higher applied fields.
    URI: http://www.elsevier.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54391
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