Abstract
Inelastic neutron spectra performed at 0.4 K in a single crystal of Tb2Ti2O7, with a magnetic field applied along the [110] direction, confirm the presence of a tetragonal lattice distortion from the nominal cubic symmetry, previously evidenced below 20 K in high resolution x-ray experiments. The signature of the distortion is an inelastic line at very low energy (≈ 0.04 THz), which is also present in the powder inelastic neutron spectra of Tb2Sn2O7.
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