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, C. Kollath, T. Giamarchi, S. Capponi,, D. Poilblanc, D. Biner, K. W. Kr\"amer
TL;DR
This study investigates the thermodynamic properties of a two-leg spin-ladder compound, revealing an extended spin Luttinger-liquid phase through experimental measurements and numerical modeling.
Contribution
It provides the first detailed experimental and theoretical characterization of the spin Luttinger-liquid phase in a real ladder material.
Findings
Identification of an extended spin Luttinger-liquid phase
Quantitative agreement between experimental data and numerical models
Mapping of the phase diagram in temperature and magnetic field
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.
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