Phase change in Ge[sub 2]Sb[sub 2]Te[sub 5] films investigated by coherent phonon spectroscopy

Fo¨rst, M.; Dekorsy, T.; Trappe, C.; Laurenzis, M.; Kurz, H.; Béchevet, B.
September 2000
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
Academic Journal
Amorphous and crystalline phases of Ge[sub 2]Sb[sub 2]Te[sub 5] films are investigated by coherent phonon spectroscopy. By heating amorphous films above specific temperatures, the coherent phonon signatures exhibit pronounced changes due to the crystallization of the amorphous phase into a cubic lattice and the transition from the cubic to a hexagonal crystal structure. The phonon modes observed are identified by comparison with coherent phonon spectra of the binary Sb[sub 2]Te[sub 3] and GeTe constituents. © 2000 American Institute of Physics.


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