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

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

1997-09-26

arxiv.org/abs/cond-mat/9709295v1

Phys. Rev. B, 58 (1998) 2411

Physics

Condensed Matter

4 pages, REVTeX, 5 figures in eps-files

Scientific paper

10.1103/PhysRevB.58.2411

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.

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