Magnetic excitations in the ground state of Yb 2 Ti 2 O 7

Viviane Peçanha-Antonio, Erxi Feng, Yixi Su, Vladimir Pomjakushin, Franz Demmel, Lieh Jeng Chang, Robert J. Aldus, Yinguo Xiao, Martin R. Lees, Thomas Brückel

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We report an extensive study on the zero field ground state of a powder sample of the pyrochlore Yb 2 Ti 2 O 7 . 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.

Original languageEnglish
Article number214415
JournalPhysical Review B
Volume96
Issue number21
DOIs
Publication statusPublished - 2017 Dec 11

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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