Tomonaga-Luttinger liquid in a quasi-one-dimensional S=1 antiferromagnet observed by specific heat measurements

M. Hagiwara, H. Tsujii, C. R. Rotundu, B. Andraka, Y. Takano, N. Tateiwa, T. C. Kobayashi, T. Suzuki, S. Suga

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Abstract

Specific-heat experiments on single crystals of the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9H24N4)(NO2)ClO4 (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 (Cmag) is proportional to temperature (T) above a critical field Hc, at which the energy gap vanishes, in a temperature region above that of the long-range ordered state. The ratio Cmag/T increases as the magnetic field approaches Hc 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 conclusive evidence for a Tomonaga-Luttinger liquid.

Original languageEnglish
Article number147203
JournalPhysical Review Letters
Volume96
Issue number14
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Hagiwara, M., Tsujii, H., Rotundu, C. R., Andraka, B., Takano, Y., Tateiwa, N., Kobayashi, T. C., Suzuki, T., & Suga, S. (2006). Tomonaga-Luttinger liquid in a quasi-one-dimensional S=1 antiferromagnet observed by specific heat measurements. Physical Review Letters, 96(14), [147203]. https://doi.org/10.1103/PhysRevLett.96.147203