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Title: Neutron diffraction study of MnNiGa2—structural and magnetic behaviour
Authors: Wang, JL
Ma, L
Hofmann, M
Avdeev, M
Kennedy, SJ
Campbell, SJ
Din, MFM
Hoelzel, M
Wu, GH
Dou, SX
Keywords: Ferromagnetic materials
Isothermal processes
Magnetic properties
Temperature monitoring
Issue Date: 7-Jan-2014
Publisher: AIP Publishing
Citation: Wang, J. L., Ma, L., Hofmann, M., Avdeev, M., Kennedy, S. J., Campbell, S. J., Md Din, M. F., Hoelzel, M., & Dou, S. X. (2014). Neutron diffraction study of MnNiGa2—structural and magnetic behaviour. Journal of Applied Physics, 115(17), 17A904. doi:10.1063/1.4857455
Abstract: MnNiGa2 crystallizes in the L21 (Heusler) structure and has a ferromagnetic ordering temperature TC ∼ 192 K. Rietveld refinement of the neutron diffraction patterns indicates that the Ga atoms occupy the equivalent 8c position, while Mn and Ni share the 4a (0, 0, 0) and 4b (0.5, 0.5, 0.5) sites with a mixed occupancy of Mn and Ni atoms. It is found that that ∼83% of Mn and ∼17% Ni are located at the 4a site while ∼83% of Ni and ∼17% Mn occupy the 4b site. There is no evidence of a magneto-volume effect around TC. In agreement with this finding, our detailed critical exponent analyses of isothermal magnetization curves and the related Arrott plots confirm that the magnetic phase transition at TC is second order. © 2014,AIP Publishing LLC.
Gov't Doc #: 7672
ISSN: 17A904-1
Appears in Collections:Journal Articles

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