Abstract
A simplified model of the Jahn-Teller band effect in a conducting ferromagnet with two degenerate subbands with the peak density of states of itinerant electrons is considered. It is found that the martensite transition temperature in a narrow-band conductor as a function of the position of the Fermi level near the peak of the energy density of states varies nonmonotonically in the narrow spin electron subband. The magnetic field dependence of the martensite-austenite structural phase transition temperature in the ferromagnet is analyzed. The developed theory and calculated data for the electron density of states in Ni{sub 2}MnGa are used as the basis for estimating the variation of the martensite transition temperature with the magnetic field ({partial_derivative}T{sub m}/{partial_derivative}H), which demonstrates a satisfactory agreement with experimental data for the Heusler alloy Ni{sub 2+x}Mn{sub 1-x}Fe{sub y}Ga{sub 1-y}.
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