Antiferromagnetic Zigzag Spin Chain in Magnetic Fields at Finite Temperatures

Details Antiferromagnetic Zigzag Spin Chain in Magnetic Fields at Finite Temperatures Antiferromagnetic Zigzag Spin Chain in Magnetic Fields at Finite Temperatures

2000-04-11

arxiv.org/abs/cond-mat/0004159v2

Physics

Condensed Matter

Statistical Mechanics

accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.62.934

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($M$-$H$ 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 $M$-$H$ curve.

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