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

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

2008-08-20

arxiv.org/abs/0808.2715v2

Phys. Rev. Lett. 101, 247202 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.101.247202

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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