Influence of a magnetic field on the Jahn-Teller band effect in a conducting ferromagnet

Journal Article · Fri Jun 15 04:00:00 EDT 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S106377610706012X· OSTI ID:21072458

Goryachev, A V ^[1]; Shavrov, V G ^[2]

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1. Lukin Scientific Research Institute of Physical Problems (Russian Federation)
2. Russian Academy of Sciences, Institute of Radio Engineering and Electronics (Russian Federation)

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}.

• OSTI ID: 21072458
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 6 Vol. 104; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
ELECTRON DENSITY
ELECTRONS
ENERGY DENSITY
EXPERIMENTAL DATA
FERMI LEVEL
GALLIUM ALLOYS
HEUSLER ALLOYS
MAGNETIC FIELDS
MARTENSITE
NICKEL ALLOYS
PHASE TRANSFORMATIONS
TRANSITION TEMPERATURE