Low temperature and high pressure Raman and x-ray studies of pyrochlore Tb2Ti2O7 : phonon anomalies and possible phase transition
Abstract
We have carried out temperature and pressure-dependent Raman and x-ray measurements on single crystals of Tb2Ti2O7. We attribute the observed anomalous temperature dependence of phonons to phonon-phonon anharmonic interactions. The quasiharmonic and anharmonic contributions to the temperature-dependent changes in phonon frequencies are estimated quantitatively using mode Gr\"uneisen parameters derived from pressure-dependent Raman experiments and bulk modulus from high pressure x-ray measurements. Further, our Raman and x-ray data suggest a subtle structural deformation of the pyrochlore lattice at 9 GPa. We discuss possible implications of our results on the spin-liquid behaviour of Tb2Ti2O7.
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