Physics – Condensed Matter – Materials Science
Scientific paper
2009-04-23
Physics
Condensed Matter
Materials Science
10 figures, 26 pages. Appeared in Physical Review B, vol-79, pp-134112 (2009)
Scientific paper
10.1103/PhysRevB.79.134112
We have carried out temperature and pressure-dependent Raman and x-ray measurements on single crystals of Tb$_2$Ti$_2$O$_7$. 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\"{u}neisen 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 $\sim$ 9 GPa. We discuss possible implications of our results on the spin-liquid behaviour of Tb$_2$Ti$_2$O$_7$.
Dhalenne Guy
Dkhil Brahim
Karmakar Subhajit
Muthu D. V. S.
Poswal H. K.
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