Abstract
neutron powder diffraction measurements of orthorhombic HoCu2 are reported. The results confirm that the two cusps observed at ∼ 7 K and 10 K in the magnetization data reflect a change of the magnetic structure and the Neel temperature. In the temperature range 7 K < T < 10 K the magnetic structure is commensurable with the unit cell with a wave vector q1 = 13a∗ and the magnetic moments aligned along the a-axis. Below 7 K two groups of magnetic reflections are observed. The first group is identical to the reflections observed between 7 and 10 K; the second group may be interpreted in terms of an incommensurably modulated component along c∗ with the magnetic moment aligned along the b-axis. Hence, the low temperature magnetic structure of HoCu2 is incommensurably modulated and non-collinear, characterized by wave vectors q1 = 13a∗, q2 = qcc∗ and 2q2. Descriptions of both magnetic structures are proposed.
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