Combination of Ferromagnetic and Antiferromagnetic Features in Heisenberg Ferrimagnets

Details Combination of Ferromagnetic and Antiferromagnetic Features in Heisenberg Ferrimagnets Combination of Ferromagnetic and Antiferromagnetic Features in Heisenberg Ferrimagnets

1998-06-28

arxiv.org/abs/cond-mat/9806344v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, 9 postscript figures, RevTex

Scientific paper

10.1088/0953-8984/10/48/023

We investigate the thermodynamic properties of Heisenberg ferrimagnetic mixed-spin chains both numerically and analytically with particular emphasis on the combination of ferromagnetic and antiferromagnetic features. Employing a new density-matrix renormalization-group technique as well as a quantum Monte Carlo method, we reveal the overall thermal behavior: At very low temperatures, the specific heat and the magnetic susceptibility times temperature behave like $T^{1/2}$ and $T^{-1}$, respectively, whereas at intermediate temperatures, they exhibit a Schottky-like peak and a minimum, respectively. Developing the modified spin-wave theory, we complement the numerical findings and give a precise estimate of the low-temperature behavior.

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