Magnetic and electronic nature of layered manganese oxysulfide Sr2CuMnO3S

Abstract

We have synthesized and investigated the magnetic and electronic nature of layered manganese oxysulfide Sr2CuMnO3S which crystallizes in an unusual intergrowth structure with Cu2S2 and pyramidal MnO5 layers separated by Sr ions. A Cu 2p x-ray photoemission spectroscopy (XPS) spectrum of Sr2CuMnO3S indicates that the Cu ion is in the monovalent state, or Cu+. This feature of the Mn 2p XPS spectrum of Sr2CuMnO3S is similar to that of the parent compound La3+Mn3+O3 of colossal magnetoresistance materials. The MnO5 cluster model analysis suggests that the electronic nature of the pyramidal MnO5 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 Mn3+ in pyramidal MnO5 layers. Fitting the χ data to Curie–Weiss law provides evidence of strong second neighbor Mn–Mn interaction.