Low Temperature Properties of Quantum Antiferromagnetic Chains with Alternating Spins S=1 and 1/2

Details Low Temperature Properties of Quantum Antiferromagnetic Chains with Alternating Spins S=1 and 1/2 Low Temperature Properties of Quantum Antiferromagnetic Chains with Alternating Spins S=1 and 1/2

1996-10-14

arxiv.org/abs/cond-mat/9610109v1

Physics

Condensed Matter

13 pages, RevTeX, six figures, submitted to J. Phys. Cond. Mat

Scientific paper

10.1088/0953-8984/9/19/012

We study the low-temperature properties of S=1 and 1/2 alternating spin chains with antiferromagnetic nearest-neighbor exchange couplings using analytical techniques as well as a quantum Monte Carlo method. The spin-wave approach predicts two different low-lying excitations, which are gapped and gapless, respectively. The structure of low-lying levels is also discussed by perturbation theory in the strength of the Ising anisotropy. These analytical findings are compared with the results of quantum Monte Carlo calculations and it turns out that spin-wave theory well describes the present system. We conclude that the quantum ferrimagnetic chain exhibits both ferromagnetic and antiferromagnetic aspects.

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