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

Andrea Marcinkova, Clarina De La Cruz, Joshua Yip, Liang L. Zhao, Jiakui K. Wang, E. Svanidze, E. Morosan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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 θW are several times smaller than the ordering temperatures TORD, while the latter are remarkably high (TORD 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 TORD, 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.

Original languageEnglish
Pages (from-to)192-203
Number of pages12
JournalJournal of Magnetism and Magnetic Materials
Volume384
DOIs
StatePublished - Jun 15 2015

Funding

Work at Rice was partially supported by the NSF DMR 0847681 and DOD PECASE . Research conducted at ORNL’s High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE .

Keywords

  • Crystal field effects
  • Incommensurate magnetic structure
  • Rare earth led binary systems

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