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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

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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
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
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
Dates:
DateEvent
11 December 2017Published
11 December 2017Accepted
4 September 2017Submitted
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:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDScience and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDConselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593

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