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Quantum magnets under pressure: Controlling elementary excitations in TlCuCl3

Ruegg, C; Normand, B; Matsumoto, M; Furrer, A; McMorrow, DF; Kramer, KW; Gudel, HU; ... Boehm, M; + view all (2008) Quantum magnets under pressure: Controlling elementary excitations in TlCuCl3. PHYS REV LETT , 100 (20) , Article 205701. 10.1103/PhysRevLett.100.205701. Green open access

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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.

Type: Article
Title: Quantum magnets under pressure: Controlling elementary excitations in TlCuCl3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.100.205701
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.100.205701
Language: English
Additional information: © 2008 The American Physical Society
Keywords: ONE-DIMENSIONAL ANTIFERROMAGNETS, PHASE-TRANSITIONS, SYSTEM TLCUCL3, INSULATORS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/129532
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