Temperature and pressure dependence of Mg local modes in GaN

Kaczmarczyk, G.; Kaschner, A.; Hoffmann, A.; Thomsen, C.
January 2001
Applied Physics Letters;1/8/2001, Vol. 78 Issue 2, p198
Academic Journal
The temperature and pressure dependence of the zone-center phonons and of the local vibrational modes of magnesium in the hexagonal modification of GaN was studied within a valence-force model. The contribution caused by thermal expansion was calculated and compared with the experiment. We find that the frequency shift of the local vibrational modes arises to a much larger extent from anharmonic decay into lower energy phonons than the shift of the GaN host modes. © 2001 American Institute of Physics.


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