Superlattices made of alternating layers of nominal GeTe and Sb2Te3 have been studied by micro-Raman spectroscopy. A structural irreversible transformation into ordered GeSbTe alloy is induced by high power laser light exposure. The intensity ratio of anti-Stokes and Stokes scattering under laser illumination gives a maximum average temperature in the sample of 177 °C. The latter is lower than the growth temperature and of 400 °C necessary by annealing to transform the structure in a GeSbTe alloy. The absence of this configuration after in situ annealing even up to 300 °C evidences an electronic excitation induced-transition which brings the system into a different and stable crystalline state.
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Research Article| June 01 2016
Laser induced structural transformation in chalcogenide based superlattices
Eugenio Zallo ;
Eugenio Zallo, Ruining Wang, Valeria Bragaglia, Raffaella Calarco; Laser induced structural transformation in chalcogenide based superlattices. Appl. Phys. Lett. 30 May 2016; 108 (22): 221904. https://doi.org/10.1063/1.4953158
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