Magnetic ordering of YPd2Si-type HoNi2Si and ErNi2Si compounds

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:419

Article

Morozkin, A. V.¹  Isnard, O.²  Nirmala, R.³  Quezado, S.⁴  Malik, S. K.⁴ 

[1] Moscow MV Lomonosov State Univ, Dept Chem, House 1,Bldg 3,GSP 2, Moscow 119992, Russia

[2] CNRS, Inst Neel, 25 Rue Martyrs BP166 X, F-38042 Grenoble, France

[3] Indian Inst Technol, Madras 600036, Tamil Nadu, India

[4] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59082970 Natal, RN, Brazil

关键词: Rare earth intermetallics;    Neutron diffraction;    Magnetic properties;    Magnetocaloric effect;    Magnetic structure;   

DOI  :  10.1016/j.jmmm.2016.06.049

来源: Elsevier

【 摘 要 】

Magnetic properties of YPd2Si-type HoNi2Si and ErNi2Si were investigated via neutron diffraction and magnetisation measurements. HoNi2Si and ErNi2Si show ferromagnetic-like ordering at T-C 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 mu(B)/fu and 9.79 mu(B)/fu for HoNi2Si and ErNi2Si compounds, respectively. The HoNi2Si and ErNi2Si are soft ferromagnets with saturation magnetization of 8.1 mu(B)/fu and 7.5 mu(B)/fu, respectively at 2 K and in field of 140 kOe. The isothermal magnetic entropy change, Delta S-m, has a maximum value of -15.6 J/kg . K at 10 K for HoNi2Si and 13.9 J/kg . K 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 similar to 9 K and its magnetic structure is a sum of a-axis ferromagnetic F-a, b-axis anti ferromagnetic AF(b) and c-axis antiferrromagnetic AF(c) components of Pn'a2(1)'={1, m(x)'/[1/2, 1/2, 1/2], 2(y)'/[0, 1/2, 0], m(z)/[1/2, 0, 1/2]1 magnetic space group and propagation vector K-0=[0, 0, 0]. The holmium magnetic moment reaches a value of 9.23(9) mu(B) at 1.5 K and the unit cell of HoNi2Si undergoes isotropic contraction around the temperature of magnetic transition. (C) 2016 Elsevier B.V. All rights reserved.

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