Abstract
Raman measurements of the phonon spectrum of BiTeI at pressures of up to 20 GPa have been performed. A decrease in the linewidth of E2 vibration by almost a factor of 2 with an increase in the pressure to 3 GPa has been detected. The frequencies of all four Raman active modes increase monotonically with the pressure. These lines are observed in spectra up to ∼8 GPa. Sharp change in the spectrum occurs at pressures of 8–9 GPa, indicating a transition to the high-pressure phase, which holds up to 20 GPa. This transition is reversible and hardly has any hysteresis. A sample in the high-pressure phase is single crystal.
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Original Russian Text © Yu.S. Ponosov, T.V. Kuznetsova, O.E. Tereshchenko, K.A. Kokh, E.V. Chulkov, 2013, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2013, Vol. 98, No. 9, pp. 626–630.
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Ponosov, Y.S., Kuznetsova, T.V., Tereshchenko, O.E. et al. Dynamics of the BiTeI lattice at high pressures. Jetp Lett. 98, 557–561 (2014). https://doi.org/10.1134/S0021364013220074
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DOI: https://doi.org/10.1134/S0021364013220074