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Exact low-temperature behavior of kagome antiferromagnet at high fields

M. E. Zhitomirsky·Hirokazu Tsunetsugu
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Abstract

Low-energy degrees of freedom of a spin-1/2 kagome antiferromagnet in the vicinity of the saturation field are mapped to a hard-hexagon model on a triangular lattice. The latter model is exactly solvable. The presented mapping allows to obtain quantitative description of the magnetothermodynamics of a quantum kagome antiferromagnet up to exponentially small corrections as well as predict the critical behavior for the transition into a magnon crystal state. Analogous mapping is presented for the sawtooth chain, which is mapped onto a model of classical hard dimers on a chain.

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M. E. Zhitomirsky, Hirokazu Tsunetsugu. 2004-08-18. Exact low-temperature behavior of kagome antiferromagnet at high fields. https://doi.org/10.1103/physrevb.70.100403

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