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The influence of atomic order on the magnetic and structural properties of the ferromagnetic shape memory compound Ni2MnGa

journal contribution
posted on 11.05.2006, 14:34 by M. Kreissl, Klaus-Ulrich Neumann, Tamsin Stephens, K.R.A. Ziebeck
The effect of atomic order on the martensitic phase transition and magnetic properties of stoichiometric Ni2MnGa has been investigated in a sample quenched from 1000 ◦C. Magnetization, resistivity and x-ray diffraction measurements indicate that the structural phase transition occurs at ~103 K, substantially lower than the value reported for samples quenched from 800 ◦C and ordered in theHeusler L21 structure. Asmall reduction in the ferromagnetic moment was also observed, although the Curie temperature remained largely unaffected. The electronic Sommerfeld coefficient obtained from heat capacity measurements is enhanced but smaller than that observed for the 800 ◦C quenched sample. The results are consistent with band structure calculations and the electronic changes brought about by atomic disorder.

History

School

  • Science

Department

  • Physics

Pages

195463 bytes

Citation

KREISSL et al, 2003. The influence of atomic order on the magnetic and structural properties of the ferromagnetic shape memory compound Ni2MnGa. Journal of Physics: Condensed Matter, 15(22), pp. 3831-3839

Publisher

© Institute of Physics

Publication date

2003

Notes

This article was published in the journal, Journal of Physics: Condensed Matter [© Institute of Physics]. It is available at: http://www.iop.org/EJ/journal/JPhysCM.

ISSN

0953-8984

Language

en

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