Photoactive Pb3+ host lattice ions in photorefractive Pb5Ge3O11 investigated by magnetic resonance techniques

Autor(en): Reyher, HJ
Pape, M
Hausfeld, N
Stichwörter: CRYSTAL; FERROELECTRICS; LEAD GERMANATE; Physics; Physics, Condensed Matter
Erscheinungsdatum: 2001
Herausgeber: IOP PUBLISHING LTD
Journal: JOURNAL OF PHYSICS-CONDENSED MATTER
Volumen: 13
Ausgabe: 16
Startseite: 3767
Seitenende: 3778
Zusammenfassung: 
In photorefractive Pb5Ge3O11 and (Pb0.98Ba0.02)(5)Ge3O11 crystals, Pb2+ host lattice ions can be recharged by visible light to Pb3+. The magnetic and structural properties of this hole-trapping centre, metastable at low temperatures, are characterized by means of electron paramagnetic resonance. The axial g-parameters are found to be g(perpendicular to) = 2.0005(4) and g(parallel to) = g(perpendicular to) 0.0064(3) and the (207)pb hyperfine interaction constants are A(perpendicular to) = 34.77(5) and A(perpendicular to) = 34.64(5) GHz. This information is correlated with optical properties derived from optically detected magnetic resonance via the magnetic circular dichroism of the absorption. In this way, broad photochromic absorption bands extending from the band edge to 1.9 eV can be attributed to the Pb3+ centre. Several observations give evidence that the Pb3+ centre is involved in the holographic recharging effects observed in lead germanate.
ISSN: 09538984
DOI: 10.1088/0953-8984/13/16/307

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