Abstract
Transport properties and magnetic susceptibility have been investigated for single crystals of the magnetic conductor $\ensuremath{\beta}\ensuremath{-}{\mathrm{MnO}}_{2}.$ Resistivity, Hall coefficient, and thermoelectric power reveal the behavior of n-type metal with an anomalously small mobility. The transport properties are accompanied by a large anomaly around ${T}_{N}(\ensuremath{\approx}92 \mathrm{K})$ below which a helical magnetic long-range order forms. This indicates that the ${e}_{g}$ conduction electrons, originating from a slight off-stiochiometry, are strongly coupled with localized magnetic moments in the ${t}_{2g}$ orbitals by means of Hund's rule. Below ${T}_{N},$ the magnetoresistance shows a large anisotropy reflecting the helical magnetic structure. Below about 50 K, the mobility gradually decreases, suggesting a carrier localization. The anisotropic measurement of magnetic susceptibility on a single crystal reveals the behavior of proper-type helical magnetism qualitatively, but shows a significant deviation from a molecular-field analysis based on a localized spin model.
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