Hello colleagues,
?
I am?calculating?the phonon frequencies for stable ( or hexagonal) GST
(Ge2Sb2Te5). I am getting some?negative values (contrary to the notion of
stability and literature).?I used the unrelaxed structure to do the
calculations. Could this be the reason?
?
Henry Otunga
Dept. of Physics
Maseno UNiversity
Kenya?
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