Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2004-08-25
Physics
Condensed Matter
Other Condensed Matter
4 pages 4 figures
Scientific paper
10.1088/0953-8984/17/12/009
We present calculation of the high pressure crystal structures in selenium, including rational approximants to the recently reported incommensurate phases. We show how the incommensurate phases can be intuitively explained in terms of imaginary phonon frequencies arising from Kohn anomalies in the putative undistorted phase. We also find inconsistencies between the calculated and experimental Se-II phase - the calculations show it to be a metastable metal while the experiment finds a stable semiconductor. We propose that the experimentally reported structure is probably in error.
Ackland Graeme J.
Fox H.
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