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28 March 2024
 
  » arxiv » 0803.3720

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Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3
Ch. Rüegg ; B. Normand ; M. Matsumoto ; A. Furrer ; D. McMorrow ; K. Krämer ; H.-U. Güdel ; S. Gvasaliya ; H. Mutka ; M. Boehm ;
Date 26 Mar 2008
AbstractWe 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.
Source arXiv, 0803.3720
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