Field- and pressure-induced magnetic quantum phase transitions in TlCuCl3

By M. Matsumoto, B. Normand, T. M. Rice, M. Sigrist. 2003

153 citations recorded by the source corpus.

Thallium copper chloride is a quantum spin liquid of S=½ Cu 2 + dimers. Interdimer superexchange interactions give a three-dimensional magnon dispersion and a spin gap significantly smaller than the dimer coupling. Thisgap is closed by an applied hydrostatic pressure of approximately 2 kbar or by a magnetic field of 5.6 T, offering a unique opportunity to explore both types of quantum phase transition and their associated critical phenomena. We use a bond-operator formulation to obtain a continuous description of all disordered and ordered phases, and thus of the transitions separating these. Both pressure- and field-induced transitions may be considered as the Bose-Einstein condensation of triplet magnon excitations, and the respective phases of staggered magnetic order as linear combinations of dimer-singlet and dimer-triplet modes. We focus on the evolution with applied pressure and field of the magnetic excitations in each phase, and in particular on the gapless (Goldstone) modes in the ordered regimes which correspond to phase fluctuations of the ordered moment. The bond-operator description yields a good account of the magnetization curves and of magnon dispersion relations observed by inelastic neutron scattering under applied fields, and a variety of experimental predictions for pressure-dependent measurements.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/ab4492582e3f6eac1b7790a624b1c5b8daba2253

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In Condensed Matter Physics

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Citations in the corpus

Colloquium: Spontaneous magnon decays (2012, methodology): “The presence of this mode can be easily understood by considering a transition from the spin-liquid phase into an ordered state under an external pressure P (Matsumoto et al., 2004).”
Entanglement in many-body systems (2007, background): “In condensed matter beside describing the properties of magnetic compounds (see Matsumoto et al., 2004 for a recent survey), they capture several aspects of high-temperature superconductors, quantum Hall systems, heavy fermions, just to mention few important examples.”
Bose–Einstein condensation in magnetic insulators (2007, background): “The question of order in spin systems and possibility of BEC of magnons has been investigated theoretically for a number of quantum antiferromagnets [5, 6, 7, 8, 9, 10, 11, 12, 13].”