Abstract
Specific-heat experiments on single crystals of the quasi-one-dimensional bond-alternating antiferromagnet (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 () is proportional to temperature () above a critical field , at which the energy gap vanishes, in a temperature region above that of the long-range ordered state. The ratio increases as the magnetic field approaches from above. The data are in good quantitative agreement with the prediction of the conformal field theory in conjunction with the velocity of the excitations calculated by a numerical diagonalization, providing conclusive evidence for a Tomonaga-Luttinger liquid.
- Received 28 October 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.147203
©2006 American Physical Society