TY - JOUR
T1 - Tomonaga-Luttinger liquid in a quasi-one-dimensional S=1 antiferromagnet observed by specific heat measurements
AU - Hagiwara, M.
AU - Tsujii, H.
AU - Rotundu, C. R.
AU - Andraka, B.
AU - Takano, Y.
AU - Tateiwa, N.
AU - Kobayashi, T. C.
AU - Suzuki, T.
AU - Suga, S.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.96.147203
DO - 10.1103/PhysRevLett.96.147203
M3 - Article
AN - SCOPUS:33645830303
VL - 96
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 14
M1 - 147203
ER -