Abstract

TbCo 0·3Al 1·7 crystallizes with the cubic MgCu 2 type structure. The material orders close to ferromagnetically in a field of 30 kOe but exhibits a Néel point of 35 K in a field of 500 Oe. At 1·6 K the magnetization increases in two discontinuous steps to an extrapolated saturation moment of 6·58 μ B . A neutron diffraction experiment at 4·2 K shows a magnetic moment of 6·98 μ B ordered ferromagnetically only at the Tb sites. The situation seems to be similar to ErCo 2−ErAl 2 alloys, where disordered antiferromagnetic components stabilize as a function of the free electron concentration.

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