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Low temperature and high pressure Raman and x-ray studies of pyrochlore Tb$_2$Ti$_2$O$_7$ : phonon anomalies and possible phase transition

Authors
  • Saha, Surajit
  • Muthu, D. V. S
  • Singh, Surjeet
  • Dkhil, B.
  • Suryanarayanan, R.
  • Dhalenne, G.
  • Poswal, H. K.
  • Karmakar, S.
  • Sharma, Surinder M.
  • Revcolevschi, A.
  • Sood, A. K.
Type
Preprint
Publication Date
Apr 23, 2009
Submission Date
Apr 23, 2009
Identifiers
DOI: 10.1103/PhysRevB.79.134112
Source
arXiv
License
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External links

Abstract

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$_7$.

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