Low-temperature and high-pressure Raman and X-ray studies of pyrochlore Tb2Ti2O7: phonon anomalies and possible phase transition

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. (2009) Low-temperature and high-pressure Raman and X-ray studies of pyrochlore Tb2Ti2O7: phonon anomalies and possible phase transition Physical Review B: Condensed Matter and Materials Physics, 79 (13). 134112 _1-134112 _9. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v79/i13/e134112

Related URL: http://dx.doi.org/10.1103/PhysRevB.79.134112

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 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 ~9 GPa. We discuss possible implications of our results on the spin-liquid behavior of Tb2Ti2O7.

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Deposited On:14 Jul 2011 08:33
Last Modified:04 Oct 2011 13:36

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