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

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dc.creatorSaha, Surajit
dc.creatorMuthu, D. V. S
dc.creatorSingh, Surjeet
dc.creatorDkhil, B.
dc.creatorSuryanarayanan, R.
dc.creatorDhalenne, G.
dc.creatorPoswal, H. K.
dc.creatorKarmakar, S.
dc.creatorSharma, Surinder M.
dc.creatorRevcolevschi, A.
dc.creatorSood, A. K.
dc.date2009-04-23
dc.date.accessioned2026-07-07T13:07:53Z
dc.date.available2026-07-07T13:07:53Z
dc.descriptionWe 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 Grüneisen 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$_7$.
dc.description10 figures, 26 pages. Appeared in Physical Review B, vol-79, pp-134112 (2009)
dc.identifierhttps://arxiv.org/abs/0904.3630
dc.identifierhttp://arxiv.org/abs/0904.3630
dc.identifierdoi:10.1103/PhysRevB.79.134112
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/228239
dc.subjectMaterials Science
dc.titleLow temperature and high pressure Raman and x-ray studies of pyrochlore Tb$_2$Ti$_2$O$_7$ : phonon anomalies and possible phase transition
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