We have 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. A Cu 2p x-ray photoemission spectroscopy (XPS) spectrum of Sr 2CuMnO 3S indicates that the Cu ion is in the monovalent state, or Cu +. This feature of the Mn 2p XPS spectrum of Sr 2CuMnO 3S is similar to that of the parent compound La 3+Mn 3+O 3 of colossal magnetoresistance materials. The MnO 5 cluster model analysis suggests that the electronic nature of the pyramidal MnO 5 layers belongs to a strongly correlated electron system, and the system is the so-called Mott insulator resulting from the strongly correlated electron nature. Magnetic susceptibility (χ) exhibits low-dimensional antiferromagnetic ordering of Mn 3+ in pyramidal MnO 5 layers. Fitting the χ data to Curie-Weiss law provides evidence of strong second neighbor Mn-Mn interaction.
ASJC Scopus subject areas
- Physics and Astronomy(all)