Pulsed-Field Ultrasonic Experiments in the Quasi-2D Antiferromagnet Cs2CuBr4 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-11-14

AUTHORS

B. Wolf, P. T. Cong, N. Krüger, F. Ritter, W. Assmus, M. Lang

ABSTRACT

The magnetic insulators Cs2CuCl4 and Cs2CuBr4 are model systems for a frustrated quasi-two-dimensional triangular-lattice spin-1/2 Heisenberg antiferromagnet with a weak interlayer coupling. The quasi-two-dimensional character manifests itself in a broad maximum at Tmax in the magnetic susceptibility, which for Cs2CuCl4 has been found to mark the upper bound for a spin-liquid regime (R. Coldea et al. in Phys. Rev. B 68:134424, 2003). Motivated by the observation of characteristic B2 dependencies in the elastic constants and ultrasound attenuation in the spin-liquid regime for this material, we look for corresponding signatures in the related Cs2CuBr4 compound at low temperatures T≤4.2 K and fields B≤50 T. We observe a softening of the elastic constant up to Bs∼32 T (B∥a) and a maximum in the sound attenuation at 0.86 Bs. Both quantities exhibit the same characteristic B2 dependence as found for Cs2CuCl4, suggesting the existence of a spin-liquid phase in Cs2CuBr4 as well. More... »

PAGES

236-241

References to SciGraph publications

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URI

http://scigraph.springernature.com/pub.10.1007/s10909-012-0825-y

DOI

http://dx.doi.org/10.1007/s10909-012-0825-y

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https://app.dimensions.ai/details/publication/pub.1025642646


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