Geometrical magnetic frustration in rare-earth chalcogenide spinels

G. C. Lau, R. S. Freitas, B. G. Ueland, P. Schiffer, R. J. Cava

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Abstract

We have characterized the magnetic and structural properties of the Cd Ln2 Se4 (Ln=Dy,Ho), and Cd Ln2 S4 (Ln=Ho,Er,Tm,Yb), spinels. We observe all compounds to be normal spinels, possessing a geometrically frustrated sublattice of lanthanide atoms with no observable structural disorder. Fits to the high-temperature magnetic susceptibilities indicate these materials to have effective antiferromagnetic interactions, with Curie-Weiss temperatures ΘW ∼-10 K, except Cd Yb2 S4 for which ΘW ∼-40 K. The absence of magnetic long-range order or glassiness above T=1.8 K strongly suggests that these materials are a different venue in which to study the effects of strong geometrical frustration, potentially as rich in interesting physical phenomena as that of the pyrochlore oxides.

Original languageEnglish (US)
Article number054411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number5
DOIs
StatePublished - Aug 1 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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