Antiferromagnetic order in disorder-induced insulating phase of SrRu1-xMnxO3 (0.4 ≤ x ≤ 0.6)

• Published in: Journal of the Physical Society of Japan 2005-06, Vol.74 (6), p.1706-1709
• Main Authors: YOKOYAMA, Makoto, SATOH, Chimato, SAITOU, Akinori, KAWANAKA, Hirofumi, BANDO, Hiroshi, OHOYAMA, Kenji, NISHIHARA, Yoshikazu
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Physics
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/JPSJ.74.1706

We have performed powder neutron diffraction measurements on the solid solutions of SrRu1-xMnxO3, and found that the itinerant ferromagnetic order observed in pure SrRuO3 changes into the C-type 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 1.1 μB (x=0.4) to 2.6 μB (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.