Neutron powder diffraction and Mossbauer spectroscopy (Sn-119 and Gd-155) studies of the CeScSi-type GdMgSn and GdMgPb compounds

Article

关键词: SILICON SAMPLE HOLDERS;    MAGNETIC-PROPERTIES;    COMPOUNDS R;    R=CE-ND;    TM;    PR;    SM;    TEMPERATURES;    TB;   

DOI  :  10.1103/PhysRevB.89.174428

来源: SCIE

【 摘 要 】

The magnetic structures of the CeScSi-type GdMgSn and GdMgPb compounds have been studied by both neutron powder diffraction and Mossbauer spectroscopy (Sn-119 and Gd-155). The neutron diffraction results show that the two compounds adopt incommensurate antiferromagnetic structures at 5.4 K with propagation vectors (k) over right arrow = [0.910,0.077,0] for GdMgSn and (k) over right arrow = [0.892,0,0] for GdMgPb. The magnetic moments lie in the basal plane, which is confirmed by both Sn-119 and Gd-155 Mossbauer spectroscopy. Mossbauer spectroscopy refinements and simulations reveal that the magnetic structure of GdMgSn is cycloidal at low temperature and undergoes a transition to a modulated magnetic structure above T similar to 40 K. A similar magnetic transition is inferred for GdMgPb. The magnetic structures of GdMgSn and GdMgPb are compared with those of other CeScSi-type compounds.

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