Pressure Dependence of the Elastic Compliance s₁₁ near the Transition Temperature of SrTiO₃

Abstract

in a recent paper we have shown that the resonance frequency and the elastic compliance s

Cubic to Tetragonal Phase Transition of SrTiO3 under Epitaxial Stress: An X-Ray Backscattering Study

“…The CT transition temperature T a is known to be pressure dependent. Measured by different groups, this dependence of T a was found to be 17 K/GPa [40], 29 K/GPa [41,42], and 5 K/GPa [42] for hydrostatic pressure, and 180 K/GPa under uniaxial pressure [40] by ultrasonic resonance. We can relate these values to the effect of the epitaxial stress on the transition temperature in our case.…”

Pressure‐dependent Raman modes near the cubic‐tetragonal transition in strontium titanate

“…In order to obtain c T P ð Þ, we also analyzed the observed frequencies 4 of the Raman modes studied using Equation 6 as a function of pressure with the Table 2). The Raman frequencies of those modes which were calculated (Equation 4) from the observed data 4 using the pressure dependence of c T P ð Þ, were then fitted to the observed Raman frequencies analyzed (Equation 6) according to: (12) and the fitted parameters c 0 , c 1 and c 2 were determined ( Table 2). The Raman frequencies of those modes which were calculated (Equation 4) from the observed data 4 using the pressure dependence of c T P ð Þ, were then fitted to the observed Raman frequencies analyzed (Equation 6) according to: (12) and the fitted parameters c 0 , c 1 and c 2 were determined ( Table 2).…”

“…The pressure dependences of the c T P ð Þ were then obtained according to Equation 3 as plotted in Figures 1-3 for various Raman modes studied in SrTiO 3 . The Raman frequencies of those modes which were calculated (Equation 4) from the observed data 4 using the pressure dependence of c T P ð Þ, were then fitted to the observed Raman frequencies analyzed (Equation 6) according to: (12) and the fitted parameters c 0 , c 1 and c 2 were determined ( Table 2). Figures 4-7 give our plots of the Raman frequency shifts calculated (Equations 4 and 12) with the observed data 4 for various modes as a function of pressure for the cubic-tetragonal transition in SrTiO 3 .…”

“…4 The effect of the high pressure on the ABO 3 perovskites has also been considered in some earlier studies. This transition has been studied as the temperature-induced 11 and also the pressure-induced using various experimental techniques such as acoustic, [12][13][14][15] Brillouin, 16 Raman, 4,17 and X-ray diffraction 4 for SrTiO 3 . This transition has been studied as the temperature-induced 11 and also the pressure-induced using various experimental techniques such as acoustic, [12][13][14][15] Brillouin, 16 Raman, 4,17 and X-ray diffraction 4 for SrTiO 3 .…”

“…[5][6][7][8][9][10] SrTiO 3 as one of the most-studied perovskites, undergoes the cubic-tetragonal phase transition which is considered as the anti-ferrodistortive transition (P C = 9.5 GPa at room temperature). This transition has been studied as the temperature-induced 11 and also the pressure-induced using various experimental techniques such as acoustic, [12][13][14][15] Brillouin, 16 Raman, 4,17 and X-ray diffraction 4 for SrTiO 3 . The P-T phase diagram for the cubic-tetragonal transition in SrTiO 3 has been obtained experimentally using the ultrasonic measurements, 14,15 Brillouin, 15,16,18 Raman 4,17,19 spectroscopy and X-ray diffraction.…”