Magnetic ordering of YPd2Si-type HoNi2Si and ErNi2Si compoundsстатья
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Дата последнего поиска статьи во внешних источниках: 28 октября 2016 г.
Аннотация:Magnetic properties of YPd2Si-type HoNi2Si and ErNi2Si were investigated via neutron diffraction and magnetization measurements. HoNi2Si and ErNi2Si show ferromagnetic-like ordering at TC of 9 K and 7 K, respectively. The paramagnetic Weiss temperatures are 9 K and 11 K and the effective magnetic moments are 10.76 mB/fu and 9.79 mB/fu for HoNi2Si and ErNi2Si compounds, respectively. The HoNi2Si and ErNi2Si are soft ferromagnets with saturation magnetization of 8.1 mB/fu and 7.5 mB/fu, respectively at 2 K and in field of 140 kOe. The isothermal magnetic entropy change, dSm, has a maximum value of -15.6 J/kgK at 10 K for HoNi2Si and -13.9 J/kgK at 6 K for ErNi2Si for a field change of 50 kOe.
Neutron diffraction study in zero applied field shows mixed ferromagnetic-antiferromagnetic ordering of HoNi2Si at ~9 K and its magnetic structure is a sum of a-axis ferromagnetic Fa, b-axis antiferromagnetic AFb and c-axis antiferrromagnetic AFc components of Pn'a21' = {1, mx'/[1/2, 1/2, 1/2], 2y'/[0, 1/2, 0], mz/[1/2, 0, 1/2]} magnetic space group and propagation vector K0 = [0, 0, 0]. The holmium magnetic moment reaches a value of 9.23(9) mB at 1.5 K and the unit cell of HoNi2Si undergoes isotropic contraction around the temperature of magnetic transition.