Structural singularities in $\mathrm{Ge_{x}Te_{100−x}}$ films

Piarristeguy, A. A.; Pradel, A.; Kaban, I.; Ravindren, S.; Boolchand, P.; Escalier, R.; Luckas, J.; Micoulaut, M.; van Eijk, J.; Jóvári, P.

doi:10.1063/1.4928504

Journal Article

PUBDB-2015-04813

Structural singularities in $\mathrm{Ge_{x}Te_{100−x}}$ films

Piarristeguy, A. A. (Corresponding author) ; Micoulaut, M. ; Escalier, R. ; Jóvári, P.>Extern* ; Kaban, I.>Extern* ; van Eijk, J.>Extern* ; Luckas, J. ; Ravindren, S. ; Boolchand, P. ; Pradel, A.>Extern*

2015
American Institute of Physics Melville, NY

The journal of chemical physics 143(7), 074502 (2015) [10.1063/1.4928504]

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Please use a persistent id in citations: doi:10.1063/1.4928504

Abstract: Structural and calorimetric investigation of Ge$_{x}$Te$_{100−x}$ films over wide range of concentration 10 < x < 50 led to evidence two structural singularities at x ~ 22 at. % and x ~ 33-35 at. %. Analysis of bond distribution, bond variability, and glass thermal stability led to conclude to the origin of the first singularity being the flexible/rigid transition proposed in the framework of rigidity model and the origin of the second one being the disappearance of the undercooled region resulting in amorphous materials with statistical distributions of bonds. While the first singularity signs the onset of the Ge–Ge homopolar bonds, the second is related to compositions where enhanced Ge–Ge correlations at intermediate lengthscales (7.7 Å) are observed. These two threshold compositions correspond to recently reported resistance drift threshold compositions, an important support for models pointing the breaking of homopolar Ge–Ge bonds as the main phenomenon behind the ageing of phase change materials.

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