Magnetic frustration in the sawtooth lattice of ZnLn2S4 (Ln = Er, Tm, Yb) olivines
G. C. Lau, B. G. Ueland, R. S. Freitas, M. L. Dahlberg, P. Schiffer, R. J. Cava
Abstract
We report the magnetic properties of the ZnLn2S4 (Ln = Er, Tm, Yb) olivines, in which the magnetic lanthanide ions are in a potentially frustrated geometry consisting of sawtooth chains of corner-sharing triangles. Fits to the high temperature magnetic susceptibility yielded Curie-Weiss temperatures of theta ~ -4, -13, and -75 K for the Er, Tm, and Yb compounds respectively. Antiferromagnetic interactions indicated by these negative theta values, along with the absence of magnetic long range order above T = 1.8 K, suggest that geometrical frustration of magnetic ordering exists in these sulfide olivines as has been observed previously in the rare earth chalcogenide spinels.
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