Magnetic structures in the rich magnetic phase diagram of Ho2RhIn8
Abstract
The magnetic phase diagram of the tetragonal Ho2RhIn8 compound has similar features to many related systems, revealing a zero magnetic field AF1 and a field-induced AF2 phases. Details of the magnetic order in the AF2 phase were not reported yet for any of the related compounds. In addition, only the Ho2RhIn8 phase diagram contains a small region of the incommensurate zero-field AF3 phase. We have performed a number of neutron diffraction experiments on single crystals of Ho2RhIn8 using several diffractometers including experiments in both horizontal and vertical magnetic fields up to 4 T. We present details of the magnetic structures in all magnetic phases of the rich phase diagram of Ho2RhIn8. The Ho magnetic moments point along the tetragonal c axis in every phase. The ground-state AF1 phase is characterized by propagation vector k = (1/2, 0, 0). The more complex ferrimagnetic AF2 phase is described by four propagation vectors k0 = (0, 0, 0), k1 = (1/2, 0, 0), k2 = (0, 1/2, 1/2), k3 = (1/2, 1/2, 1/2). The magnetic structure in the AF3 phase is incommensurate with kAF3 = (0.5, δ, 0). Our results are consistent with theoretical calculations based on crystal field theory.
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