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Soft mode mechanism of the transition into the low-temperature ferroelastic phase in K₃Na(CrO₄)₂ crystals

DOI: 10.21883/ftt.2016.12.43867.187

Kitaev Yu.E.¹, Krylov A.S.², Maksimova T.I.¹

¹Ioffe Institute, St. Petersburg, 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.

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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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