Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3

Details Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3 Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3

2008-03-26

arxiv.org/abs/0803.3720v1

Phys. Rev. Lett. 100, 205701 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.205701

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.

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