Change of exciton-phonon interaction in layered ferroelastic crystals (Cs3Bi2I9) |
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| Authors: | Fedir V Motsnyi Oleksandr M Smolanka Sergiy V Virko |
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| Institution: | a Department of Optics and Spectroscopy, V. Lashkaryov Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine, 41 Nauky Prospect, 03028 Kyiv, Ukraine
b Uzhgorod National University, 46 Pidgirna Street, 88000 Uzhgorod, Ukraine |
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| Abstract: | The half-width of exciton absorption band (n=1) of Cs3Bi2I9 layered ferroelastic crystals was studied carefully as function of temperature in the range from 5 to 300 K. For the first time, we have found a new physical effect: change of exciton-phonon interaction (from weak to strong) in the same sample as temperature increases. It was established that the temperature value T*=150 K may be considered as characteristic one, below which a crystal loses the nature of layered substance. The effect is explained using a model that takes into account the reconstruction of the crystal lattice from non-layered to layered one. |
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| Keywords: | 64 70 Kb 71 35 Cc 77 80 Dj |
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