Structural, magnetic properties, and electronic structure of Cr1−xMnxO2 solid solution

Abstract

Bulk Cr1-xMnxO2 samples are prepared by high pressure synthesis technology. The crystal structure, magnetic properties and electronic structure of the samples are investigated by experiments and theoretical calculation. The crystal structure of the samples are indexed to a rutile structure with space group P42/mnm. The lattice parameter a of the samples remains basically unchanged in accordance with Vegard's law, but the lattice parameter c decreases due to increasing Mn dopant content (x) as well as strong Metal–Metal bonding along the c-axis. The saturation magnetization of the Cr1-xMnxO2 samples decreases with an increase in x. According to XPS analysis, there is electron transfer between Mn and Cr in Cr1-xMnxO2. Mn exists as Mn2+ and Mn3+ions, and part of Cr is oxidized to Cr6+. Based on the XPS analysis, the magnetic moment of Cr1-xMnxO2 is calculated and its value is in accordance with the experimental data.