Absorption cross sections and number densities of electron and hole polarons in congruently melting LiNbO3

Autor(en): Merschjann, C.
Schoke, B.
Conradi, D.
Imlau, M. 
Corradi, G.
Polgar, K.
Stichwörter: CENTERS; CRYSTALS; DEFECTS; GENERATION; INDUCED INFRARED-ABSORPTION; LIB3O5; LIGHT-INDUCED ABSORPTION; LITHIUM TRIBORATE; PARAMAGNETIC-RESONANCE; Physics; Physics, Condensed Matter
Erscheinungsdatum: 2009
Herausgeber: IOP PUBLISHING LTD
Journal: JOURNAL OF PHYSICS-CONDENSED MATTER
Volumen: 21
Ausgabe: 1
Zusammenfassung: 
The number densities and absorption cross sections of both optically generated and reduction-induced small electron and hole polarons in LiNbO3 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 sigma(pol) approximate to (4-14) x 10(-22) m(2), comparable to that for Fe2+. In all cases the ratio of occupied to unoccupied polaronic sites is less than 10(-2).
ISSN: 09538984
DOI: 10.1088/0953-8984/21/1/015906

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