Abstract
Magnetic, structural and Mn K-edge X-ray absorption near-edge structure (XANES) spectroscopic studies have been made on the stoichiometric La 1− x Eu x MnO 3 (0⩽ x⩽1) system with trivalent Mn 3+. The system undergoes an A-type antiferromagnetic (AF) order with Néel temperature T N ranging from 139 K for LaMnO 3 to 42 K for smaller EuMnO 3, above which a two-dimensional ferromagnetic (2D-FM) short range fluctuation prevails with T 2D> T N 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 e g electrons and weak c-axis AF coupling of t 2g electrons. The anomalous decrease of T N with increasing smaller Eu substitution is due to more localized t 2g electrons from a stronger crystal field splitting and lattice distortion in the MnO 6 octahedron. Both T 2D and T N are field dependent and nearly merge at higher applied fields.
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