The compound TlCuCl3 represents a model system of dimerized quantum spins with strong interdimer interactions. We investigate the triplet dispersion as a function of temperature by inelastic neutron scattering experiments on single crystals. By comparison with a number of theoretical approaches we demonstrate that the description of Troyer, Tsunetsugu, and Wuertz [Phys. Rev. B 50, 13515 (1994)] provides an appropriate quantum statistical model for dimer spin systems at finite temperatures, where many-body correlations become particularly important.
@article{arxiv.cond-mat/0510487,
title = {Quantum Statistics of Interacting Dimer Spin Systems},
author = {Ch. Rüegg and B. Normand and M. Matsumoto and Ch. Niedermayer and A. Furrer and K. W. Krämer and H. U. Güdel and Ph. Bourges and Y. Sidis and H. Mutka},
journal= {arXiv preprint arXiv:cond-mat/0510487},
year = {2009}
}
Comments
4 pages, 4 figures, to appear in Physical Review Letters