Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3

Abstract

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.

4 pages, 4 figures

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• Quantum magnetism and criticality
• Order and quantum phase transitions in the cuprate superconductors
• Field- and pressure-induced magnetic quantum phase transitions in TlCuCl_3
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• Pressure-Induced Successive Magnetic Phase Transitions in the Spin Gap System TlCuCl${}_3$
• Dominance of excitation continuum in the longitudinal spectrum of weakly coupled Heisenberg S=1/2 chains

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