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25 April 2024

» arxiv » 0808.2715

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Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
Ch. Rüegg ; K. Kiefer ; B. Thielemann ; D. F. McMorrow ; V. Zapf ; B. Normand ; M. B. Zvonarev ; P. Bouillot ; C. Kollath ; T. Giamarchi ; S. Capponi ; D. Poilblanc ; D. Biner ; K. W. Krämer ;
Date:	20 Aug 2008
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, which exists over a broad range of temperature. Based on an ideal spin-ladder Hamiltonian, comprehensive numerical modelling of the ladder specific heat is presented across its complete phase diagram. It is found to be in excellent quantitative agreement with the experimental data.
Source:	arXiv, 0808.2715
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