反強磁性体SrLaVMoO6の構造とスピン分極率

概要

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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.