Tomonaga-Luttinger Liquid in a Quasi-One-Dimensional S=1 Antiferromagnet Observed by the Specific Heat

Abstract

Specific heat experiments on single crystals of the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C_9H_24N_4)(NO_2)ClO_4, alias NTENP, have been performed in magnetic fields applied both parallel and perpendicular to the spin chains. We have found for the parallel field configuration that the magnetic specific heat (C_mag) is proportional to temperature (T) above a critical field H_c, at which the energy gap vanishes, in a temperature region above that of the long-range ordered state. The ratio C_mag/T increases as the magnetic field approaches H_c from above. The data are in good quantitative agreement with the prediction of the c=1 conformal field theory in conjunction with the velocity of the excitations calculated by a numerical diagonalization, providing a conclusive evidence for a Tomonaga-Luttinger liquid.

arXiv comment4 pages, 4 postscript figures

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Cited by in corpus (14)

• Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
• Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
• Novel ordering of an S = 1/2 quasi one-dimensional Ising-like anitiferromagnet in magnetic field
• Phase Diagrams, Distinct Conformal Anomalies and Thermodynamics of Spin-1 Bond-Alternating Heisenberg Antiferromagnetic Chain in Magnetic Fields
• Magnetic Properties and Thermal Entanglement on a Triangulated Kagome Lattice
• Exotic criticality in the dimerized spin-1 $XXZ$ chain with single-ion anisotropy
• Unconventional field-induced spin gap in an $S=1/2$ chiral staggered chain
• Edge singularities in high-energy spectra of gapped one-dimensional magnets in strong magnetic fields
• Platforms for the realization and characterization of Tomonaga-Luttinger liquids
• Magnetic field-induced quasiparticle excitation in Nb3Sn: Evidence for anisotropic s-wave pairing
• Modes of magnetic resonance of S=1 dimer chain compound NTENP
• Tomonaga-Luttinger liquid and quantum criticality in spin-1/2 antiferromagnetic Heisenberg chain C14H18CuN4O10 via Wilson ratio
• Bosonic representation of spin operators in the field-induced critical phase of spin-1 Haldane chains
• Two topological phases in exchange alternating spin-1 nanographene chains