title: Multiple magnetic interactions in A-site-ordered perovskite-structure oxides.
abstract: Multiple magnetic interactions in A-site-ordered perovskite-structure oxides AA'3B2B'2O12 with A'-site Cu and B-site Fe ions are highlighted here. Several new compounds with this structure type were obtained by high-pressure synthesis and have been given unusual magnetic properties due to multiple interactions of Cu and Fe ions (A'-A', A'-B, A'-B', B-B, B-B', and B'-B' interactions). The magnetic interaction is discussed here in light of the results of magnetic structure analysis with neutron powder diffraction data and x-ray magnetic circular dichroism spectra obtained in x-ray absorption experiments. The characteristic structural framework with ordered cation arrangements and the variation in the oxidation state of the ions at the A' and B sites are shown to play roles crucial for the diverse and intriguing physical properties of these new compounds.
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan. Japan Science and Technology Agency, CREST, Chiyoda-ku, Tokyo 102-0075, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Shimakawa
authors.forename: Masaichiro
authors.initials: M
authors.lastname: Mizumaki