Theoretical analysis of the experiments on the double-spin-chain compound -- KCuCl${}_3$

Abstract

We have analyzed the experimental susceptibility data of KCuCl${}_3$ and found that the data are well-explained by the double-spin-chain models with strong antiferromagnetic dimerization. Large quantum Monte Carlo calculations were performed for the first time in the spin systems with frustration. This was made possible by removing the negative-sign problem with the use of the dimer basis that has the spin-reversal symmetry. The numerical data agree with the experimental data within 1% relative errors in the whole temperature region. We also present a theoretical estimate for the dispersion relation and compare it with the recent neutron-scattering experiment. Finally, the magnitude of each interaction bond is predicted.

4 pages, REVTeX, 5 figures in eps-files

References in corpus (2)

• Spin gap in the Quasi-One-Dimensional S=1/2 Antiferromagnet: Cu2(1,4-diazacycloheptane)2Cl4
• Vanishing of the negative-sign problem of quantum Monte Carlo simulations in one-dimensional frustrated spin systems

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