Magnetic properties and magnetic structures of the CeScSi-type RMgPb (R=Ce–Nd, Sm, Gd–Tm) compounds

Neutron powder diffraction and Mössbauer spectroscopy (119Snand155Gd) studies of the CeScSi-type GdMgSn and GdMgPb compounds

“…139) [1][2][3] and order antiferromagnetically with T N ranging from 2.5 K for TmMgPb to 79 K for SmMgSn [3,4]. A few other compounds in the RTX series (where T is a transition metal and X is a p-block element) such as PrScSi [5], PrScGe [5,6], and ErZrSb [7] are antiferromagnetic at low temperatures, while most CeScSi-type compounds are ferromagnetic at low temperatures: RScSi (R = Ce,Nd,Sm,Gd) [5,[8][9][10], RScGe (R = Ce − Nd,Sm,Gd,Tb) [5,6,[8][9][10][11][12][13][14], RZrSb (R = Gd − Tm) [7,15], and RTiGe (R = Gd,Tb) [16][17][18][19][20].…”

“…Neutron powder diffraction studies on the CeScSi-type RMgSn and RMgPb compounds [4,21,22] have revealed relatively complex magnetic structures with similar magnetic arrangements for any given rare-earth element. For example, at very low temperatures PrMgSn, PrMgPb, NdMgSn, and NdMgPb each adopt commensurate antiferromagnetic structures, TbMgSn and TbMgPb adopt incommensurate sine-wave-modulated magnetic structures, and DyMgSn, DyMgPb, HoMgSn, HoMgPb, ErMgSn, and ErMgPb adopt square-wave-modulated magnetic structures [4,22].…”

“…For example, at very low temperatures PrMgSn, PrMgPb, NdMgSn, and NdMgPb each adopt commensurate antiferromagnetic structures, TbMgSn and TbMgPb adopt incommensurate sine-wave-modulated magnetic structures, and DyMgSn, DyMgPb, HoMgSn, HoMgPb, ErMgSn, and ErMgPb adopt square-wave-modulated magnetic structures [4,22]. The only exception to this consistency seems to be between the * pierric.lemoine@ensicaen.fr † nicholas.lee-hone@mail.mcgill.ca TmMgSn/TmMgPb pair.…”

“…The only exception to this consistency seems to be between the * pierric.lemoine@ensicaen.fr † nicholas.lee-hone@mail.mcgill.ca TmMgSn/TmMgPb pair. TmMgSn adopts a square-wavemodulated magnetic structure while TmMgPb adopts a more complicated magnetic structure with two propagation vectors [4,22].…”

“…The first provides local information on magnetic environments, while the second yields values for ordered moments and a description of the long-range magnetic order [23]. We have therefore used these techniques to complete the magnetic structure characterization of the CeScSi-type RMgSn and RMgPb series by studying the antiferromagnetic structure of GdMgSn and GdMgPb (T N = 48(2) K and 47(2) K, respectively) [3,4]. We performed 119 Sn and 155 Gd Mössbauer spectroscopy and neutron powder diffraction using a largearea flat-plate-geometry sample holder [24,25].…”