Abstract
It is shown that a static electric field affects the intensity ratio of the EPR lines of Cr 5+ ( d 1) in SrTiO 3 at 77K. The experimental results can be accounted for quantitatively by considering for the 2T 2g electronic ground state of Cr 5+ a strong Jahn-Teller interaction with localized ρ g mode. The degeneracy of the resulting vibronic ground state is lifted appreciably by a macroscopic strain which, as a result of the large electrostrictive coupling in SrTiO 3, is induced at moderate electric field strengths.
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