Abstract
Due to the interplay between RKKY exchange interaction, crystalline-electric field (CEF) effects and geometric frustration due to the AlB2-derived hexagonal crystal structure, the study of R2PdSi3 (R = rare earth) has been found to be a challenging field in rare earth magnetism. In this contribution we present the results of neutron diffraction experiments on a Ho2PdSi3 single crystal in the magnetically ordered state at T = 1.6 K. The compound orders antiferromagnetically in the basal plane with the propagation vector τ = (1/7-δ, 2δ, 0) where δ ∼ 0.01 r.l.u. In magnetic fields applied along the (11̅0) magnetic hard axis, the structure persists up to the highest measured field of 5 T. The dependence of the intensities as a function of field suggests that the τ structure is a single-k multi-domain structure.
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