Anomalous stress effects on the fluorescence of SrTiO3:Cr3+
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Abstract
The effect of a uniaxial stress on the fluorescence of Cr3+ in SrTiO3 at helium temperatures cannot be described by a linear perturbation of the crystal field at the chromium site. A [111] stress greater than 26.5 kg/mm2 produces a change in the crystal field from the initial tetragonal field to a trigonal field. L'effet d'une compression uniaxiale sur la fluorescence du Cr3+ dans le SrTiO3 a la temperature d'helium, ne peut pas etre decrit en termes d'une perturbation lineaire du champ crystallin au site du chrome. Une compression suivant l'axe [1, 1, 1] plus grande que 26.5 kg/mm2 change le champ crystalline de la configuration intiale tetragonale en une configuration trigonale.