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Giant thermodynamical optical effect near ferroelastic phase transition point in Cs3Bi2I9 layered crystal
Authors:Fedir V Motsnyi  Oleksandr M Smolanka  Evgen Yu Peresh
Institution:a V.E. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
b Institute for Nuclear Research, National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine
c Uzhgorod National University, 88000 Uzhgorod, Ukraine
Abstract:For the first time we have found a new giant thermodynamical optical effect near the ferroelastic phase transition point in Cs3Bi2I9 layered crystal. The effect is appeared as periodical oscillations in time of the reflection coefficient. This phenomenon is caused by the small temperature deviations in thermodynamical system the appearance of which in the reflection spectra is strongly amplified in the ferroelastic phase transition point. The optical oscillations are explained on the base of a model that takes into account the temperature dependence of the refractive index through the order parameter (spontaneous strain) of the crystal.
Keywords:64  70  Kb  71  35  Cc  78  40  Fy
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