On the crystal structure and magnetic properties of the Mn 0.94Ti0.06CoGe alloy

P Shamba, University of Wollongong
J L. Wang, University of Wollongong
J C. Debnath, University of Wollongong
R Zeng, University of Wollongong
F Hong, University of Wollongong
Z X. Cheng, University of Wollongong
A J. Studer, ANSTO
S J. Kennedy, ANSTO
S X. Dou, University of Wollongong

Shamba, P., Wang, J., Debnath, J. C., Zeng, R., Hong, F., Cheng, Z. X., Studer, A. J., Kennedy, S. J. & Dou, S. X. (2013). On the crystal structure and magnetic properties of the Mn 0.94Ti0.06CoGe alloy. Japanese Journal of Applied Physics, 113 (2013), 17A941-1-17A941-3.

Abstract

Structural and magnetic properties of Mn0.94Ti 0.06CoGe have been studied by a combination of bulk magnetisation and neutron diffraction measurements over the temperature range of 5 K-350 K. The crystal structural transition occurs at Tstr (∼235 K) with a change in symmetry from the low temperature orthorhombic TiNiSi-type structure (space group Pnma) to the high temperature hexagonal Ni2In-type structure (space group P63/mmc) and the magnetic phase transition takes place around TC 270 K. It is found that the structural transition around Tstr is incomplete and there is a co-existence of the orthorhombic and hexagonal structures between Tstr and TC (∼270 K). These results are discussed in connection with the magnetic and magnetocaloric behaviours in Mn0.94Ti0.06CoGe.