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Comment on “Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations”

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Science Advances  22 Mar 2019:
Vol. 5, no. 3, eaar5066
DOI: 10.1126/sciadv.aar5066

Figures

  • Fig. 1 TA mode in (22¯0) Brillouin zone.

    (Top) Energy scan at Q = (2.25, −1.75, 0) showing an unsplit TA phonon line shape in PMN-xPT with x = 0.29. The solid line is a fit to a single damped harmonic oscillator. Data were measured with Ef = 14.7 meV. Errors bars represent ±√N, where N is the total number of counts. (Bottom) Energy scans from Manley et al. (1) for Q = (2 + H, H − 2, 0) using Ei = 25 meV. The ghoston energy is indicated by a red arrow for each value of H.

  • Fig. 2 TA mode in (110) Brillouin zone.

    Energy scan at Q = (1.25, 0.75, 0) in PMN-xPT with x = 0.29. The solid line is a fit to a single damped harmonic oscillator line shape. These data were measured on the NIST BT4 triple-axis spectrometer with Ef = 13.7 meV. Errors bars represent ±√N, where N is the total number of counts.

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