Journal article

Quantum magnets under pressure: controlling elementary excitations in TlCuCl₃

  • Rüegg, Christian London Centre for Nanotechnology, University College London, United Kingdom
  • Normand, Bruce Département de Physique, Université de Fribourg, Switzerland - Theoretische Physik, ETH-Hönggerberg, Switzerland
  • Matsumoto, M. Department of Physics, Faculty of Science, Shizuoka University, Japan
  • Furrer, A. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen, Switzerland
  • McMorrow, D. F. London Centre for Nanotechnology, University College London, United Kingdom
  • Krämer, K. W. Department of Chemistry and Biochemistry, University of Bern, Switzerland
  • Güdel, Hans-Ulrich Department of Chemistry and Biochemistry, University of Bern, Switzerland
  • Gvasaliya, S. N. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen, Switzerland
  • Mutka, H. Institut Laue Langevin, Grenoble, France
  • Boehm, M. Institut Laue Langevin, Grenoble, France
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    21.05.2008
Published in:
  • Physical Review Letters. - 2008, vol. 100, p. 205701
English We follow the evolution of the elementary excitations of the quantum antiferromagnet TlCuCl₃ through the pressure-induced quantum critical point, which separates a dimer-based quantum disordered phase from a phase of long-ranged magnetic order. We demonstrate by neutron spectroscopy the continuous emergence in the weakly ordered state of a low-lying but massive excitation corresponding to longitudinal fluctuations of the magnetic moment. This mode is not present in a classical description of ordered magnets, but is a direct consequence of the quantum critical point
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300817
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