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Figure 4
Phonon dispersion curve of (a) phase II, and of (b) phase II′. The unit-cell structure of II is shown at the bottom left, the mapped PES along wavevector R2 bottom middle and the structure of II′ at the bottom right. |
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Figure 4
Phonon dispersion curve of (a) phase II, and of (b) phase II′. The unit-cell structure of II is shown at the bottom left, the mapped PES along wavevector R2 bottom middle and the structure of II′ at the bottom right. |