Geometrical Magnetic Frustration in Rare Earth Chalcogenide Spinels
G.C. Lau, R.S. Freitas, B.G. Ueland, P. Schiffer, and R.J. Cava
TL;DR
This study investigates the magnetic and structural properties of certain rare earth chalcogenide spinels, revealing their geometrical frustration and potential for novel physical phenomena due to suppressed magnetic order.
Contribution
It provides the first detailed characterization of CdLn2Se4 and CdLn2S4 spinels, highlighting their geometrical frustration and absence of magnetic order at low temperatures.
Findings
All compounds are normal spinels with frustrated lanthanide sublattices.
Effective antiferromagnetic interactions with Curie-Weiss temperatures around -10 K to -40 K.
No magnetic long-range order or glassiness observed above 1.8 K.
Abstract
We have characterized the magnetic and structural properties of the CdLn2Se4 (Ln = Dy, Ho), and CdLn2S4 (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 theta ~ -10 K, except CdYb2S4 for which theta ~ -40 K. The absence of magnetic long range order or glassiness above T = 1.8 K strongly suggests that these materials are a new venue in which to study the effects of strong geometrical frustration, potentially as rich in new physical phenomena as that of the pyrochlore oxides.
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