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/content/aip/journal/adva/5/3/10.1063/1.4916585
2015-03-26
2016-12-07

Abstract

This work reports a detailed temperature dependent Raman study on the mixed crystals of K(NH)HAsO (KADA) from 5K to 300K in the spectral range of 60-1200cm−1, covering tetragonal to orthorhombic structural phase transition accompanied by paraelectric to ferroelectric transition at * ∼ 60K. Multiple phase transitions below transition temperature ( * ∼ 60K) are marked by the appearance of new modes, splitting of existing ones as well as anomalies in the self-energy parameters (i.e. mode frequencies and damping coefficient) of the phonon modes. Temperature independent behaviour of damping coefficient and abrupt jump in the mode frequency of some of the internal vibrations of AsO tetrahedra as well as external vibrations clearly signal long range ferroelectric ordering and proton ordering below *. In addition, we observed that temperature dependence of many prominent phonon modes diverges significantly from their normal anharmonic behaviour below * suggesting potential coupling between pseudospins and phonons.

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