Magnetic and neutron diffraction study on Ni_2In type (Mn_(1-x)Fe_x)_(65)Sn_(35)

摘要

The hexagonal Ni_2In (B8_2) type Mn_7Sn_4 has a collinear ferrimagnetic structure. The intermetallic compound (Mn_(1-x)Fe_x)_(65)Sn_(35) systems crystallize in the Ni_2In type in the range of 0 ≤ χ ≤ 0.4. The present paper describes the results of investigations of the crystal and magnetic properties of the Ni_2In type (Mn_(1-x) Fe_x)_(65)Sn_(35) compounds with X-ray and neutron diffraction, as well as magneto metric methods. The neutron diffraction study at room temperature for some samples revealed that the Fe atoms occupy only 2(d) site forχ = 0.1 and2(a),2(d) site for χ > 0.1. The neutron diffraction study at T= 10 K for χ = 0.25 revealed the ferromagnetic structure. The inverse susceptibility χ~(-1)-T curve shows a bend in the lower x suggesting the ferrimagnetic nature but nearly linear in the higher x suggesting the ferromagnetic nature.