層状Mn酸化硫化物Sr_2CuMnO_3Sの物性 : 磁性体物理

概要

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We synthesized and investigated the magnetic and electronic nature of layered manganese oxysulfide Sr_2CuMnO_3S, which crystallizes in an unusual intergrowth structure with Cu_2S_2 and pyramidal MnO_5 layers separated by Sr ions. The Cu 2p XPS spectrum for Sr_2CuMnO_3S indicates that Cu ions are in the monovalent state, or "Cu^+". The features of the Mn 2p XPS spectrum for Sr_2CuMnO_3S are similar to these of the parent compound La^<3+>Mn^<3+>O_3 of CMR materials. MnO_5 cluster model analysis suggests that the electronic nature of the pyramidal MnO_5 layers belongs to a strongly correlated electron system, and that the system is a so-called Mott insulator as a result of its strongly correlated electron nature. The magnetic susceptibility ( χ ) exhibits low-dimensional antiferromagnetic ordering of Mn^<3+> the pyramidal MnO_5 layers. Fitting the χ data to the Curie-Weiss law gives evidence of the strong second-neighbor Mn-Mn interaction.
社団法人日本磁気学会の論文
2002-04-01