Influence of structural transition on transport and optical properties of Ni[sub 2]MnGa alloy

Zhou, Y.; Jin, Xuesong; Xu, Huibin; Kudryavtsev, Y. V.; Lee, Y. P.; Rhee, J. Y.
June 2002
Journal of Applied Physics;6/15/2002, Vol. 91 Issue 12, p9894
Academic Journal
The transport and optical properties of Ni[sub 2]MnGa alloy in the martensitic and austenitic states were investigated. The dependence of the temperature coefficient of resistivity on temperature shows kinks at the structural and ferroparamagnetic transitions. Electron-magnon and electron-phonon scattering are analyzed to be the dominant scattering mechanisms of the Ni[sub 2]MnGa alloy in the martensitic and austenitic states, respectively. It was observed that the martensite reveals a higher Debye temperature compared to the austenite, which was explained by a difference in the restoring coefficient between atoms. A Lorentz model that consists of two oscillators was employed to fit the interband contribution to optical conductivity (OC). It is found that the structural transition plays a more important role for the changes in OC spectrum than the thermal-expansion effect.


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