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Gorshenkov, M.
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article
Magnetic and transport properties of as-prepared Mn<sub>2</sub>CoGa
Abstract
Magnetic and transport properties of as-prepared Mn<sub>2</sub>CoGa polycrystalline Heusler alloy were investigated. Results of magnetic measurements were found to agree well with literature data, i.e., the studied Mn<sub>2</sub>CoGa is a ferrimagnet with magnetic moment of 2.03 μ<sub>B</sub>/f.u. and a high Curie temperature T<sub>C</sub> = 728 K. Measurements of transport properties revealed that electrical resistivity rho of Mn<sub>2</sub>CoGa is anomalously large (~250 μΩ.cm at room temperature) and demonstrates a complex temperature dependence. Specifically, in the measured temperature interval from 80 K to 375 K, the electrical resistivity is proportional to T<sup>2</sup> up to T ~200 K while at higher temperatures rho can be fitted by rho(T) = A + B.exp(-CT) expression. These changes in the scattering mechanisms are accompanied by a change of the magnetoresistance sign from positive at T below~200 K to negative at higher temperatures.