About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Analysis of stress and temperature dependence of fluorescence in SrTiO3:Cr3+
Abstract
We write a configurational potential for SrTiO3 which depends on strain and the soft optic-mode coordinates whose wave vector lies at the corner of the Brillouin zone. Minimizing this potential gives the static response of the crystal to applied stress. Below the cubic-to-tetragonal transition temperature at 106°K, uniaxial stress applied in the [111] direction induces a transition from the natural tetragonal to a trigonal phase, but transitions for [100] and [110] stresses are not found. A crystal-field calculation gives the R-line emission energy of Cr3+ impurities. The results fit the temperature-dependence anomaly found by Stokowsky and Schawlow and, within limits, the pressure dependence found by Burke and Pressley. However, pronounced discrepancies appear at stresses along the [100] and [110] directions which exceed critical values of 10 and 57 kg/mm2, respectively, suggesting that new phases of unknown character appear. The crystal-field parameter values inferred from the comparison with experiment support the nearest-neighbor approximation for the cubic component of the crystal-field, but not for lower-symmetry components. Our calculations disagree with a reported measurement of the stress dependence of the transition temperature. © 1970 The American Physical Society.