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arxiv: 0808.2715 · v2 · submitted 2008-08-20 · ❄️ cond-mat.str-el

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

Ch. R\"uegg , K. Kiefer , B. Thielemann , D. F. McMorrow , V. Zapf , B. Normand , M. B. Zvonarev , P. Bouillot
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C. Kollath T. Giamarchi S. Capponi D. Poilblanc D. Biner K. W. Kr\"amer
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classification ❄️ cond-mat.str-el
keywords phasediagramheatladderluttinger-liquidspecificspinspin-ladder
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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.

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