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Hagiwara, M Osaka University
Tsujii, H The Institute of Physical and Chemical Research
Rotundu, C R University of Florida
Andraka, B University of Florida
Takano, Y University of Florida
Tateiwa, N Japan Atomic Energy Agency
Kobayashi, T C Okayama University
Suzuki, T Osaka University
Suga, S Osaka University
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 (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 conclusive evidence for a Tomonaga-Luttinger liquid.
Digital Object Identifer:10.1103/PhysRevLett.96.147203
Published with permission from the copyright holder. This is the institute's copy, as published in Physical Review Letters, April 2006, Volume 96, Issue 14, Pages 4.
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Physical Review Letters
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