Antiferromagnetic Zigzag Spin Chain in Magnetic Fields at Finite Temperatures
Abstract
We study thermodynamic behaviors of the antiferromagnetic zigzag spin chain in magnetic fields, using the density-matrix renormalization group method for the quantum transfer matrix. We focus on the thermodynamics of the system near the critical fields in the ground-state magnetization process(- curve): the saturation field, the lower critical field associated with excitation gap, and the field at the middle-field cusp singularity. We calculate magnetization, susceptibility and specific heat of the zigzag chain in magnetic fields at finite temperatures, and then discuss how the calculated quantities reflect the low-lying excitations of the system related with the critical behaviors in the - curve.
Keywords
Cite
@article{arxiv.cond-mat/0004159,
title = {Antiferromagnetic Zigzag Spin Chain in Magnetic Fields at Finite Temperatures},
author = {Nobuya Maeshima and Kouichi Okunishi},
journal= {arXiv preprint arXiv:cond-mat/0004159},
year = {2009}
}
Comments
accepted for publication in Physical Review B