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, and S. Suga
Phys. Rev. Lett. 96, 147203 – Published 12 April 2006

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.

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  • Received 28 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.147203

©2006 American Physical Society

Authors & Affiliations

M. Hagiwara1, H. Tsujii2, C. R. Rotundu3, B. Andraka3, Y. Takano3, N. Tateiwa4, T. C. Kobayashi5, T. Suzuki6,*, and S. Suga6

  • 1KYOKUGEN, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
  • 2RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 3Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA
  • 4JAEA, Advanced Science Research Center, Tokai, Ibaraki 319-1195, Japan
  • 5Department of Physics, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan
  • 6Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan

  • *Present address: ISSP, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.

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Issue

Vol. 96, Iss. 14 — 14 April 2006

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