Wilson ratio of a Tomonaga-Luttinger liquid in a spin-1/2 Heisenberg ladder

Preprint

18 March 2012

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.1110.5653

Abstract

Using micromechanical force magnetometry, we have measured the magnetization of the strong-leg spin-1/2 ladder compound (C$_7$H$_{10}$N)$_2$CuBr$_2$ at temperatures down to 45 mK. Low-temperature magnetic susceptibility as a function of field exhibits a maximum near the critical field H_c at which the magnon gap vanishes, as expected for a gapped one-dimensional antiferromagnet. Above H_c a clear minimum appears in the magnetization as a function of temperature as predicted by theory. In this field region, the susceptibility in conjunction with our specific heat data yields the Wilson ratio R_W. The result supports the relation R_W=4K, where K is the Tomonaga-Luttinger-liquid parameter.

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All Related Versions

Version 1, 2011-10-25, ArXiv
Version 2, 2012-03-18, ArXiv
Published version: Physical Review Letters, 108 (9), 097201.

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