Magnetic properties and magnetic structures of the CeScSi-type RMgPb (R=Ce-Nd, Sm, Gd-Tm) compounds
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- 作者：P. Lemoine ; A. Verni¨¨re ; G. Venturini ; J.F. Mar¨ºch¨¦ ; S. Capelli ; B. Malaman
- 关键词：Intermetallic compound ; Ternary rare-earth magnesium plumbide ; Magnetic property ; Neutron powder diffraction ; Sine-wave modulated magnetic structure
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2012
- 出版时间：September, 2012
- 年：2012
- 卷：324
- 期：19
- 页码：2937-2952
- 全文大小：3082 K
文摘
Investigations made by powder X-ray diffraction, magnetic measurements and neutron powder diffraction on the CeScSi-type ternary magnesium plumbides RMgPb (R=Ce-Nd, Sm, Gd-Tm) are reported. Macroscopic magnetic measurements performed in the 2-300 K temperature range show that these compounds follow a Curie-Weiss law in the paramagnetic state (except SmMgPb) and behave antiferromagnetically at low temperature (T¦¡Ü61 K). Field dependence of the magnetization performed at 5 K evidence metamagnetic-like behaviors (Hcrit<7 T). Neutron powder diffraction evidenced complex antiferromagnetic structures in fair agreement with the magnetic data. PrMgPb and NdMgPb compounds present a commensurate antiferromagnetic structure, while (Tb-Er)MgPb are characterized by incommensurate sine-wave modulated magnetic structure down to lower temperature or square-wave magnetic structure due to appearance of higher odd integer harmonics. CeMgPb and TmMgPb evidence more complex sine-wave modulated magnetic structures, never encountered with the CeScSi-type structure, characterized by two propagation vectors. These results are discussed and compared with those of the isotypic RMgSn compounds.