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Thompson JD, McClarty PA, Prabhakaran D, et al. Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore Yb_{2}Ti_{2}O_{7} in a Magnetic Field. Phys Rev Lett. 2017;119(5):057203doi: 10.1103/PhysRevLett.119.057203.
Thompson, J. D., McClarty, P. A., Prabhakaran, D., Cabrera, I., Guidi, T., & Coldea, R. (2017). Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore Yb_{2}Ti_{2}O_{7} in a Magnetic Field. Physical review letters, 119(5), 057203. https://doi.org/10.1103/PhysRevLett.119.057203
Thompson, J D, et al. "Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore Yb_{2}Ti_{2}O_{7} in a Magnetic Field." Physical review letters vol. 119,5 (2017): 057203. doi: https://doi.org/10.1103/PhysRevLett.119.057203
Thompson JD, McClarty PA, Prabhakaran D, Cabrera I, Guidi T, Coldea R. Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore Yb_{2}Ti_{2}O_{7} in a Magnetic Field. Phys Rev Lett. 2017 Aug 04;119(5):057203. doi: 10.1103/PhysRevLett.119.057203. Epub 2017 Aug 01. PMID: 28949704.
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Phys Rev Lett. 2017 Aug 04;119(5):057203. doi: 10.1103/PhysRevLett.119.057203. Epub 2017 Aug 01.

Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore Yb_{2}Ti_{2}O_{7} in a Magnetic Field.

Physical review letters

J D Thompson, P A McClarty, D Prabhakaran, I Cabrera, T Guidi, R Coldea

Affiliations

  1. Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
  2. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom.
  3. Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany.

PMID: 28949704 DOI: 10.1103/PhysRevLett.119.057203

Abstract

The frustrated pyrochlore magnet Yb_{2}Ti_{2}O_{7} has the remarkable property that it orders magnetically but has no propagating magnons over wide regions of the Brillouin zone. Here we use inelastic neutron scattering to follow how the spectrum evolves in cubic-axis magnetic fields. At high fields we observe, in addition to dispersive magnons, a two-magnon continuum, which grows in intensity upon reducing the field and overlaps with the one-magnon states at intermediate fields leading to strong renormalization of the dispersion relations, and magnon decays. Using heat capacity measurements we find that the low- and high-field regions are smoothly connected with no sharp phase transition, with the spin gap increasing monotonically in field. Through fits to an extensive data set of dispersion relations combined with magnetization measurements, we reevaluate the spin Hamiltonian, finding dominant quantum exchange terms, which we propose are responsible for the anomalously strong fluctuations and quasiparticle breakdown effects observed at low fields.

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