Structures and spin polarization of an antiferromagnet SrLaVMoO₆

Abstract

  The magnetic and transport properties of bulk polycrystalline samples of double perovskite SrLaVMoO₆ have been investigated. Structural analyses have shown that the samples are almost in single phase. Magnetization measurements have indicated that the SrLaVMoO₆ compound exhibits a cusp at 125K, which is attributable to an antiferromagnetic transition. Electrical resistivity ρ for the compound showed metallic temperature dependence from 10 to 300 K, with a resistivity ρ value 450 μΩcm at 10 K. A spin polarization P value was measured to be 0.50 using the point-contact Andreev reflection (PCAR) technique. It has been found from X-ray photoemission spectroscopy (XPS) study that SrLaVMoO₆ closely resembles the half-metallic Sr₂FeMoO₆ in the electronic state of the Mo. These results were discussed in term of possible half metallic antiferromagnetism mediated by double-exchange interaction.