Journal
PHYSICAL REVIEW B
Volume 79, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.134112
Keywords
anharmonic lattice modes; deformation; elastic moduli; Gruneisen coefficient; high-pressure effects; phonon-phonon interactions; Raman spectra; terbium compounds
Funding
- Indo-French Centre for Promotion of Advanced Research (IFCPAR)
- Centre Franco-Indien pour la Promotion de la Recherche Avancee (CEFIPRA) [3108-1]
- Department of Science and Technology (DST), India
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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 Gruneisen 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 similar to 9 GPa. We discuss possible implications of our results on the spin-liquid behavior of Tb2Ti2O7.
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