title: Absorption cross sections and number densities of electron and hole polarons in congruently melting LiNbO(3).
abstract: The number densities and absorption cross sections of both optically generated and reduction-induced small electron and hole polarons in LiNbO(3) are determined by means of time-resolved pump-multiprobe spectroscopy. The data are obtained for free (Nb(Nb)(4+)) and bound (Nb(Li)(4+)) electron polarons, bound Nb(Li)(4+):Nb(Nb)(4+) electron bipolarons, and bound O(-) hole polarons. The peak absorption cross sections are in the range of σ(pol)≈(4-14) × 10(-22) m(2), comparable to that for Fe(2+). In all cases the ratio of occupied to unoccupied polaronic sites is less than 10(-2).
authors.affiliation: Universität Osnabrück, Fachbereich Physik, D-49069 Osnabrück, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Merschjann
authors.forename: B
authors.initials: B
authors.lastname: Schoke
authors.forename: D
authors.initials: D
authors.lastname: Conradi
authors.forename: M
authors.initials: M
authors.lastname: Imlau
authors.forename: G
authors.initials: G
authors.lastname: Corradi
authors.forename: K
authors.initials: K
authors.lastname: Polgár