Wilson ratio of a Tomonaga-Luttinger liquid in a spin-1/2 Heisenberg ladder |
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Authors: | Ninios K Hong Tao Manabe T Hotta C Herringer S N Turnbull M M Landee C P Takano Y Chan H B |
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Institution: | Department of Physics, University of Florida, Gainesville, Florida 32611, USA. |
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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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