Suppression of ferroelectricity in YCrO$_{3}$

We report the results of temperature dependent X-ray diffraction (XRD) and Raman spectroscopy measurements on YCrO3. X-ray diffraction studies carried out up to 900K and subsequent Rietveld refinement of the data show that there is no evidence of any structural phase transition in YCrO$_{3}$ across the paraelectric to ferroelectric phase transitions ($T_{C\, }$\textasciitilde 470K) and the material retains the orthorhombic structure with \textit{Pnma }space group. Subsequently, temperature dependent unpolarized Raman spectroscopy measurements, from 300 K to 600 K, were carried out to investigate the role of phonons across the $T_{C\, }$. All Raman lines below 600 cm$^{-1}$ are assigned to definite phonon modes of \textit{Pnma }structures on the basis of comparison to a previous experiment at room temperature. For further analysis of the Raman data, the line shape parameters were obtained by fitting a Lorentzian function to each peak. YCrO$_{3}$ shows a strong anomalous temperature variation near $T_{C\, }$in the peak positions and line widths for selected modes as a function of temperature. .