title: Magnetic interactions in A-site-ordered perovskites LnCu3(Ge(3/4)Ga(1/4))4O12 (Ln = La, Dy).
abstract: A-site-ordered perovskites LaCu(3)(Ge(3/4)Ga(1/4))(4)O(12) and DyCu(3)(Ge(3/4)Ga(1/4))(4)O(12) were synthesized, and their magnetism was investigated. Ferromagnetic ordering of the square-planar-coordinated Cu(2+) spins was observed at 12-13 K in both compounds, and the Dy(3+) moment in DyCu(3)(Ge(3/4)Ga(1/4))(4)O(12) stayed paramagnetic below T(C). The decoupling of the magnetic behavior of Cu(2+) and Dy(3+) sublattices revealed the weak magnetic interaction between Cu(2+) and Dy(3+).
authors.affiliation: Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011 Japan. saito@scl.kyoto-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Saito
authors.forename: Ryuta
authors.initials: R
authors.lastname: Yamada
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Shimakawa