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Evidence for Photoinduced Hole Coupling in BaTiO 3 :Co
Author(s) -
Chanussot G.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221870240
Subject(s) - metastability , delocalized electron , condensed matter physics , materials science , polaron , molecular physics , conduction band , coupling (piping) , chemical physics , field (mathematics) , chemistry , physics , electron , mathematics , organic chemistry , quantum mechanics , pure mathematics , metallurgy
A possible photoinduced correlation mechanism in BaTiO 3 :Co is described. The underlying microscopic process is a local hole photoinjection at a Co 3+ site close to a preexisting metastable hole. The Jahn‐Teller field at the Co 2+ 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 T c .
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