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Thermodynamics of the spin Luttinger liquid in a model ladder material
Ch Rüegg1, K Kiefer, B Thielemann
1London Centre for Nanotechnology, University College London, London WC1E 6BT, United Kingdom.
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 modeling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the entire phase diagram.
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