Geometrical magnetic frustration in rare-earth chalcogenide spinels

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

doi:10.1103/PhysRevB.72.054411

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 language	English (US)
Article number	054411
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.72.054411
State	Published - Aug 1 2005

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.72.054411

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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.",

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AU - Freitas, R. S.

AU - Ueland, B. G.

AU - Schiffer, P.

AU - Cava, R. J.

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AB - 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.

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Geometrical magnetic frustration in rare-earth chalcogenide spinels

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