Synthesis, crystal structure, and magnetic properties of novel 2D kagome materials RE3Sb3Mg2O14 (RE = La, Pr, Sm, Eu, Tb, Ho): Comparison to RE3Sb3Zn2O14 family

M. B. Sanders, K. M. Baroudi, J. W. Krizan, O. A. Mukadam, R. J. Cava

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The crystal structures and magnetic properties of RE3Sb3Mg2O14 (RE = La, Pr, Sm, Eu, Tb, Ho) with a perfect kagome lattice are presented and compared to RE3Sb3Zn2O14. Rietveld structure refinements were performed using X-ray diffraction data, indicating that the layered compounds are fully structurally ordered. The compounds crystallize in a rhombohedral supercell of the cubic pyrochlore structure, in the space group R-3m. Magnetic susceptibility measurements show no signs of magnetic ordering above 2 K. The RE3Sb3Mg2O14 family is similar to that of RE3Sb3Zn2O14; however, the series reported here features a fully ordered distribution of cations in both the nonmagnetic antimony and magnetic rare earth kagome lattices. Unlike the offsite disorder that Zn2+ experiences in RE3Sb3Zn2O14, the magnesium sites in RE3Sb3Mg2O14 are completely ordered. Here we compare the magnetic properties in both series of kagome compounds to determine how significant Zn2+'s positional ordering is within this structure type. The compounds reported here appear to be relatively defect-free and are therefore model systems for investigating magnetic frustration on an ideal 2D rare earth kagome lattice.

Original languageEnglish (US)
Pages (from-to)2056-2065
Number of pages10
JournalPhysica Status Solidi (B) Basic Research
Volume253
Issue number10
DOIs
StatePublished - Oct 1 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Keywords

  • crystal structure
  • magnetic materials
  • magnetic properties
  • powder diffraction

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