
M Hagiwara, H Tsujii, C R Rotundu, B Andraka, Y Takano, T Suzuki, and S Suga. Field Induced TomonagaLuttinger liquid of a quasionedimensional S=1 antiferromagnet. Modern Physics Letters B, 21, No 16, p. 965, 2007.
Abstract:
We review the results of specificheat experiments on the S = 1 quasionedimensional (quasi1D) bondalternating antiferromagnet Ni(C9H24N4)(NO2)ClO4, alias NTENP. At low temperatures above the transition temperature of a fieldinduced longrange order, the magnetic specific heat (Cmag) of this compound becomes proportional to temperature (T), when a magnetic field along the spin chains exceeds the critical field Hc at which the energy gap vanishes. The ratio Cmag/T, which increases as the magnetic field approaches Hc from above, is in good quantitative agreement with a prediction of conformal field theory combined with the fielddependent velocity of the excitations calculated by the Lanczos method. This result is the first conclusive evidence for a Tomonaga–Luttinger liquid in a gapped quasi1D antiferromagnet.
Keywords:
Tomonaga–Luttinger liquid, onedimensional S = 1 antiferromagnet, specific heat
URL:
http://www.worldscinet.com/mplb/21/2116/S0217984907013626.html
Posted by
Costel R Rotundu
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