Magnetic Properties of Zr_<1-x>Ti_xZn_2, Zr_<1-x>Y_xZn_2, Zr_<1-x>Nb_xZn_2 and Zr_<1-x>Hf_xZn_2

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Magnetization measurement has been made on ternary alloys Zr_<1-x>M_xZn_2, where M=Ti, Y, Nb and Hf with x up to 0.3, 0.1, 0.2 and 0.33 respectively. The ferromagnetism in ZrZn_2 disappears by alloying Y, Nb, and Hf at x≃0.03, 0.07, and 0.15 respectively, and Ti alloys are all ferromagnetic. The Curie temperature of Ti alloys increases initially with increasing x, reaching a maximum value of 49°K at x-=0.2, then decreases. The magnetization of ferromagnetic alloys does not saturate up to 80 kOe. The spontaneous magnetization M(0,T) of all ferromagnetic alloys varies with temperature following a relationship, M(0,T)^2=M(0,0)^2[1-(T/T_c)^2]. The paramagnetic susceptibilities of Ti and Hf alloys follow approximately the Curie-Weiss law, whereas those of Nb alloys do not. The paramagnetic moments of Ti and Hf alloys derived from the Curie constants are nearly constant, having no correlation with the spontaneous magnetization at 0°K. The above experimental results are interpreted on the itinerant model by assuming a sharp peak in the density of states of ZrZn_2 at the Fermi energy.
社団法人日本物理学会の論文
1968-07-05