Faculté des sciences

Quantum statistics of interacting dimer spin systems

Rüegg, Ch. ; Normand, Bruce ; Matsumoto, M. ; Niedermayer, Ch. ; Furrer, A. ; Krämer, K. W. ; Güdel, Hans-Ulrich ; Bourges, Ph. ; Sidis, Y. ; Mutka, H.

In: Physical Review Letters, 2006, vol. 95, p. 267201

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 Würtz [Phys. Rev. B 50, 13 515... More

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    Summary
    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 Würtz [Phys. Rev. B 50, 13 515 (1994)] provides an appropriate quantum statistical model for dimer spin systems at finite temperatures, where many-body correlations become particularly important.