Strong magnetic coupling in the hexagonal R5Pb3 compounds (R = Gd-Tm)

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:384

Article

Marcinkova, Andrea¹  de la Cruz, Clarina²  Yip, Joshua¹  Zhao, Liang L.¹  Wang, Jiakui K.¹  Svanidze, E.¹  Morosan, E.¹ 

[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

关键词: Rare earth led binary systems;    Incommensurate magnetic structure;    Crystal field effects;   

DOI  :  10.1016/j.jmmm.2015.02.015

来源: Elsevier

【 摘 要 】

We have synthesized the R5Pb3 (R=Gd-Tm) compounds in polycrystalline form and performed neutron scattering and magnetization measurements. For all R5Pb3 reported here the Weiss temperatures theta w are several times smaller than the ordering temperatures T-ORD, while the latter are remarkably high (T-ORD up to 275 K for R = Gd) compared to other known R-M binaries (M = Si, Ge, Sn and Sb). The magnetic order changes from ferromagnetic (FM) in R = Gd, Tb to antiferromagnetic (AFM) in R = Dy-Tm. Below T-ORD, the magnetization measurements together with neutron powder diffraction show complex magnetic behaviors and reveal the existence of up to three additional phase transitions, believed to be a result of large anisotropic exchange and/or crystal electric field effects, induced high anisotropy. The R5Pb3 magnetic unit cells for R=Tb-Tm can be described with incommensurate magnetic wave vectors with spin modulation either along the c axis in R=Tb, Er and Tm, or within the ab plane in R=Dy and Ho. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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