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
quantum phase transitions
quantized spin models (magnetism)
dynamic properties of magnetic materials
neutron inelastic scattering (condensed matter)
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
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 10587
- DOI 10.1103/PhysRevLett.100.205701
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300817
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