High-pressure Raman and x-ray study of the spin-frustrated pyrochlore Gd{sub 2}Ti{sub 2}O{sub 7}
- Department of Physics, Indian Institute of Science, Bangalore 560012 (India)
- Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS, UMR8182, Batiment 414, Universite Paris-Sud, 91405 Orsay (France)
- Synchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400085 (India)
Pressure-dependent Raman and x-ray diffraction studies of spin-frustrated pyrochlore Gd{sub 2}Ti{sub 2}O{sub 7} have been carried out at room temperature up to {approx}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 et al. [Nature 420, 54 (2002)] who observed magnetic correlations under high pressure in Tb{sub 2}Ti{sub 2}O{sub 7}, a frustrated spin-liquid system.
- OSTI ID:
- 20853492
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 6; Other Information: DOI: 10.1103/PhysRevB.74.064109; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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