Abstract
We study magnetic and transport properties of an equiatomic quaternary CoFeVSi Heusler alloy. By using a molecular beam epitaxy technique at $400{\phantom{\rule{0.16em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}$, CoFeVSi epitaxial films with stoichiometry on MgO substrate have been grown. The saturation magnetic moment at 10 K and Curie temperature are $\ensuremath{\sim}2.1\phantom{\rule{4pt}{0ex}}{\ensuremath{\mu}}_{\mathrm{B}}$/f.u. and $\ensuremath{\sim}260$ K, respectively. From electrical and magnetotransport measurements, we find the small temperature dependence of the electrical resistivity, temperature-dependent ambipolar carrier transport, and positive linear magnetoresistance at low temperatures. An anomalous Hall conductivity of $\ensuremath{\sim}67$ S/cm at 10 K is slightly deviated from the calculated value from a Berry phase approach. On the basis of the experimental data and first-principles calculations, the origin of the peculiar magnetotransport properties of the CoFeVSi film is discussed.
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