Quantum statistics of interacting dimer spin systems

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

doi:10.1103/PhysRevLett.95.267201

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Journal article

Quantum statistics of interacting dimer spin systems

Rüegg, Christian London Centre for Nanotechnology, Department of Physics and Astronomy, University College London, UK - Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen, Switzerland
Normand, Bruce Département de Physique, Université de Fribourg, Switzerland
Matsumoto, M. Department of Physics, Faculty of Science, Shizuoka University, Japan
Niedermayer, Ch. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen, Switzerland
Furrer, A. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen, Switzerland
Krämer, K. W. Department of Chemistry and Biochemistry, University of Berne, Switzerland
Güdel, Hans-Ulrich Department of Chemistry and Biochemistry, University of Berne, Switzerland
Bourges, Ph. Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay, Gif-sur-Yvette, France
Sidis, Y. Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay, Gif-sur-Yvette, France
Mutka, H. Institut Laue Langevin, Grenoble, France

19.12.2005

Published in:

Physical Review Letters. - 2006, vol. 95, p. 267201

English 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language