Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material

Abstract

The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magnetocaloric effect. We demonstrate the presence of an extended spin Luttinger-liquid phase between two field-induced quantum critical points and over a broad range of temperature. Based on an ideal spin-ladder Hamiltonian, comprehensive numerical modelling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the complete phase diagram.

arXiv comment4 pages, 4 figures, updated refs and minor changes to the text, version accepted for publication in Phys. Rev. Lett

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