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.

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

References in corpus (6)

• Bose-Einstein Condensation in Magnetic Insulators
• Controlling Luttinger liquid physics in spin ladders under a magnetic field
• Universal temperature dependence of the magnetization of gapped spin chains
• Diverging thermal expansion of the spin-ladder system (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$
• Spin-spin correlations of the spin-ladder compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$ measured by magnetostriction and comparison to Quantum Monte Carlo results
• Thermodynamic properties of the coupled dimer system Cu${}_2$(C${}_5$H${}_{12}$N${}_2$)${}_2$Cl${}_4$

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