High-pressure Raman and x-ray study of the spin-frustrated pyrochlore Gd2Ti2O7

Saha, Surajit and Muthu, DVS and Pascanut, C and Dragoe, N and Suryanarayanan, R and Dhalenne, G and Revcolevschi, A and Karmakar, Sukanta and Sharma, Surinder M and Sood, AK (2006) High-pressure Raman and x-ray study of the spin-frustrated pyrochlore Gd2Ti2O7. In: Physical Review B, 74 (6). 064109-1-064109-7.

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Abstract

Pressure-dependent Raman and x-ray diffraction studies of spin-frustrated pyrochlore Gd2Ti2O7 have been carried out at room temperature up to similar to 25 GPa and 34 GPa, respectively. A subtle distortion of the lattice at about 9 GPa is evidenced by Raman spectroscopy. X-ray results corroborate the distortion of the pyrochlore lattice at about the same pressure. Shell model lattice dynamical calculations were carried out in order to establish and understand the pressure dependence of Raman phonon frequencies. Our data may be relevant to the recent findings by Mirebeau [Nature 420, 54 (2002)] who observed magnetic correlations under high pressure in Tb2Ti2O7, a frustrated spin-liquid system.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Keywords:	gadolinium compounds;frustration;Raman spectra;X-ray diffraction;phonons;high-pressure effects.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	25 Mar 2009 11:48
Last Modified:	19 Sep 2010 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/17321

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