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| Home > Publications database > Magnetic excitations in the ground state of Yb$_{2}$ Ti$_{2}$ O$_{7}$ |
| Journal Article | FZJ-2017-08258 |
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2017
Inst.
Woodbury, NY
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Please use a persistent id in citations: http://hdl.handle.net/2128/16174 doi:10.1103/PhysRevB.96.214415
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.
Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)
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