Rüegg, Christian Normand, Bruce Matsumoto, M. Niedermayer, Ch. Furrer, A. Krämer, K. W. Güdel, Hans-Ulrich Bourges, Ph. Sidis, Y. Mutka, H. 2005-12-19 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 <b>50</b>, 13 515 (1994)] provides an appropriate quantum statistical model for dimer spin systems at finite temperatures, where many-body correlations become particularly important. application/pdf https://folia.unifr.ch/global/documents/299955 https://folia.unifr.ch/documents/299955/files/normand_qsi.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.95.267201 info:eu-repo/semantics/openAccess License undefined Physical Review Letters. - 2006, vol. 95, p. 267201 info:eu-repo/classification/udc/53 Quantum statistics of interacting dimer spin systems http://purl.org/coar/resource_type/c_6501