Antiferromagnetic Order in Disorder-Induced Insulating Phase of SrRu_<1-x>Mn_xO_3 (0.4≤x≤0.6)(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We have performed powder neutron diffraction measurements on the solid solutions of SrRu_<1-x^-> Mn_xO_3, and found that the itinerant ferromagnetic order observed in pure SrRuO_3 changes into the Ctype antiferromagnetic (AF) order with nearly localized d electrons in the intermediate Mn concentration range between x=0.4 and 0.6. With increasing x, the AF moment is strongly enhanced from 1.1μ_B (x=0.4) to 2.6μ_B (x=0.6), which is accompanied by the elongation of the tetragonal c/a ratio. These results suggest that the substitution of Mn for Ru suppresses the itinerant characteristic of the d electrons, and induces the superexchange interaction through the compression in the c plane. We have also found that the magnetic and transport properties observed in our tetragonal samples are similar to those of recently reported orthorhombic ones.
社団法人日本物理学会の論文
2005-06-15