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Soft mode mechanism of the transition into the low-temperature ferroelastic phase in K3Na(CrO4)2 crystals
1Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia 
2Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
2Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
Email: yu.kitaev@mail.ru
Поступила в редакцию: 18 мая 2016 г.
Выставление онлайн: 19 ноября 2016 г.
The sequence of phase transitions P3m1 -> C2/m -> C2/c in K3Na(CrO4)2 crystals and existence of the intermediate phase have been studied both experimentally by the Raman scattering method and theoretically by programs and retrieval tools of the Bilbao Crystallographic Server. A zone-edge soft mode responsible for a transition from the intermediate C2/m to a low-symmetry C2/c phase at T=210 K has been discovered experimentally for the first time. The symmetry of the soft mode has been established theoretically to be A2+. The temperature interval of the intermediate monoclinic phase has been determined to be 239-210 K. This work was supported by a grant from the Department of Physical Sciences of the Russian Academy of Sciences within the framework of the program "Basic Optical Spectroscopy and Its Applications."
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