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Bulletin of the American Physical Society

Wilson ratio of a Tomonaga-Luttinger liquid in the one-dimensional spin-$1/2$ Heisenberg antiferromagnet CuPzN

Christopher Aoyama, Yohei Kono, Kristen A. Marino, Haidong D. Zhou, Chisa Hotta, Mark M. Turnbull, C.P. Landee, Toshiro Sakakibara, Y. Takano

Published Mar 6, 2015• 0 citations
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Wilson ratio of a Tomonaga-Luttinger liquid in the one-dimensional spin-1/21/21/2 Heisenberg antiferromagnet CuPzN
Abstract The ground state of a one-dimensional spin-12 uniform antiferromagnetic Heisenberg chain (AfHc) is a Tomonaga–Luttinger liquid which is quantum-critical with respect to applied magnetic fields up to a saturation field μ0Hs beyond which it transforms to a fully polarized state. Wilson ratio has been predicted to be a good indicator for demarcating these phases [Phys. Rev. B 96, 220401 (2017)]. From detailed temperature and magnetic field-dependent magnetization, magnetic susceptibility and specific heat measurements in a metalorganic complex and comparisons with field theory and quantum transfer matrix method calculations, the complex was found to be a very good realization of a spin-12 AfHc. Wilson ratio obtained from experimentally obtained magnetic susceptibility and magnetic contribution of specific heat values was used to map the magnetic phase diagram of the uniform spin-12 AfHc over large regions of phase space demarcating Tomonaga–Luttinger liquid, saturation field quantum critical, and fully polarized states. Luttinger parameter and spinon velocity were found to match very well with the values predicted from conformal field theory.
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.
We found the dramatic crossover of the quantum critical dynamics of the chain antiferromagnet CuPzN which manifests itself in a change of symmetry properties of the ESR lineshape at low temperatures. We argue that such a crossover reveals the subtle interplay of two different perturbations of the isotropic Heisenberg model: i) the exchange anisotropy and ii) the staggered magnetic field induced by alternating g-factors of nonequivalent Cu sites of the unit cell of this compound. We estimate the magnitude of these perturbations, which drive the system from the ideal Tomonaga-Luttinger-Liquid state to the state with the field-induced gapped spin excitation spectrum.