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• W2324104091 abstract "Results of neutron diffraction measurements carried out for RAgSb2 (R=Ce, Pr, Nd, Tb, Dy, Ho, Er, Tm) compounds are reported. All compounds crystallize in the tetragonal ZrCuSi2-type crystal structure and, except CeAgSb2, they are collinear antiferromagnets with the Néel temperatures between 11.1 K for R=Tb and 2.0 K for R=Tm. Below Tc=9.5 K CeAgSb2 is a ferromagnet with the Ce magnetic moment equal to 0.33 μB and parallel to the c-axis. PrAgSb2 has an antiferromagnetic structure of AF II type with the magnetic unit cell (a,a,2c). In the case of NdAgSb2 a sine-wave-modulated magnetic ordering, described by the wave vector k=(0.5435,0,0), is observed. The compounds with R=Tb, Dy and Er order antiferromagnetically with the magnetic unit cell (2a,a,c). At T=1.4 K the magnetic structure of HoAgSb2 is similar to the one observed for TbAgSb2 and DyAgSb2 while at T=2.7 K the peaks of magnetic origin correspond to a new incommensurate magnetic phase with the propagation vector k=(kx,0,kz). Up to the Néel temperature equal to 5.5 K a commensurate antiferromagnetic structure and an incommensurate sine-wave-modulated one coexist. Two magnetic phases are also observed in TmAgSb2 at T=1.4 K. An increase in the temperature causes that the commensurate phase with the magnetic unit cell (2a,a,c) disappears. The magnetic moment is parallel to the b-axis in the case of R=Tb, to the [1 1 0] direction for R=Dy and parallel to the c-axis in the case of R=Er and Tm ones which correlates well with the respective signs of CEF B02-parameter. In HoAgSb2 the magnetic moment lies in the b–c plane and forms the angle ϕb=13.5° with the b-axis at 1.4 K. With increasing temperature the angle ϕb increases up to 32° about the Néel temperature. The obtained data are analysed in terms of the exchange interaction theory and crystal electric field." @default.
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• W2324104091 date "2000-10-01" @default.
• W2324104091 modified "2023-10-18" @default.
• W2324104091 title "Magnetic structures of RAgSb2 compounds" @default.
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• W2324104091 doi "https://doi.org/10.1016/s0921-4526(00)00501-9" @default.
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