Abstract
Polycrystalline sample of the ErRhSi compound have been prepared and studied by powder neutron diffraction, specific heat and electrical resistivity measurements. This compound crystallizes in the orthorhombic TiNiSi-type structure. The magnetic phase transition at T t=2.3 K and the Néel temperature T N=8.5 K have been determined by the temperature dependencies of the intensities of the magnetic peaks, specific heat and electrical resistivity. At 1.5 K a commensurate magnetic structure, described by the propagation vector k = (0 1 2 0) coexists with the incommensurate one with k =(0,0.4184(4),0) . Above T t only incommensurate phase with the propagation vector k =(0,0.4173(2),0) at 4 K exist. Er magnetic moment is parallel to the a-axis for both phases below T t and form angle ±19° with a-axis in the temperature range T t and T N.
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