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Magnetic excitations in the ground state of Yb2Ti2O7
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Peçanha-Antonio, Viviane, Feng, Erxi, Su, Yixi, Pomjakushin, Vladimir, Demmel, Franz, Chang, Lieh-Jeng, Aldus, Robert J., Xiao, Yinguo, Lees, Martin R. and Brückel, Thomas (2017) Magnetic excitations in the ground state of Yb2Ti2O7. Physical Review B (Condensed Matter and Materials Physics), 96 (21). 214415. doi:10.1103/PhysRevB.96.214415
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Official URL: http://dx.doi.org/10.1103/PhysRevB.96.214415
Abstract
We report an extensive study on the zero field ground state of a powder sample of the pyrochlore Yb2Ti2O7. A sharp heat capacity anomaly that labels a low temperature phase transition in this material is observed at 280 mK. Neutron diffraction shows that a quasicollinear ferromagnetic order develops below Tc with a magnetic moment of 0.87(2)μB. High resolution inelastic neutron scattering measurements show, below the phase transition temperature, sharp gapped low lying magnetic excitations coexisting with a remnant quasielastic contribution likely associated with persistent spin fluctuations. Moreover, a broad inelastic continuum of excitations at ∼0.6 meV is observed from the lowest measured temperature up to at least 2.5 K. At 10 K, the continuum has vanished and a broad quasielastic conventional paramagnetic scattering takes place at the observed energy range. Finally, we show that the exchange parameters obtained within the framework of linear spin-wave theory do not accurately describe the observed zero field inelastic neutron scattering data.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Divisions: | Faculty of Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Rare earths -- Magnetic properties, Transition metals -- Magnetic properties, Neutrons -- inelastic scattering | |||||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | |||||||||
| Publisher: | American Physical Society | |||||||||
| ISSN: | 1098-0121 | |||||||||
| Official Date: | 11 December 2017 | |||||||||
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| Volume: | 96 | |||||||||
| Number: | 21 | |||||||||
| Article Number: | 214415 | |||||||||
| DOI: | 10.1103/PhysRevB.96.214415 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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