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Optical properties of phase-change materials of the GST system of the compositions Ge14Sb29Te57 and Ge15Sb15Te7 in the terahertz IR range
Russian version
Ryzhov V.A.1, Kazakova L.P.1,2, Garibova S.N.3
1Ioffe Institute, St. Petersburg, Russia
2Kirov State Forest Technical University, St. Petersburg, Russia
3Institute of Physics, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
Email: v.ryzhov@mail.ioffe.ru
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Infrared absorption spectra of chalcogenide alloys of the GST system with the compositions Ge20Sb20.5Te51, Ge15Sb15Te70 and Ge14Sb29Te57 in the amorphous and crystalline state were measured and analyzed in the range of 20-250 cm-1 (0.6-12 THz) at room temperature. Absorption at these frequencies is due to the manifestation of correlated torsional vibrations of structural units of the amorphous alloy and phonon modes of the crystal. The performed assignment of absorption bands and the revealed differences in the IR spectra make it possible to more confidently represent the possible molecular mechanism of reversible amorphous-crystalline transformations in the studied phase-changing materials. Keywords: chalcogenide alloys of the GST, GST-124 system, low-frequency IR spectra, phonons and Bose-peak, orientational phase transition.
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