Abstract
AbstractA possible photoinduced correlation mechanism in BaTiO3:Co is described. The underlying microscopic process is a local hole photoinjection at a Co3+ site close to a preexisting metastable hole. The Jahn‐Teller field at the Co2+ site transfers this pair of holes in the next cell along the rhombic direction [111] before normal polaronic or band conduction. The spatial extension of this correlation depends on a characteristic „delocalization”︁ length. This unstable conductive state appears to be possibly frozen in a permanent way below Tc.
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