Pulsed electron beam excited transient absorption in SrTiO3

Autor(en): Millers, D
Grigorjeva, L
Pankratov, V
Trepakov, VA
Kapphan, SE
Stichwörter: CRYSTALS; DEFECTS; DOPED SRTIO3; Instruments & Instrumentation; Nuclear Science & Technology; Physics; Physics, Atomic, Molecular & Chemical; Physics, Nuclear; polaron; SrTiO3; transient absorption
Erscheinungsdatum: 2002
Herausgeber: ELSEVIER SCIENCE BV
Journal: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volumen: 194
Ausgabe: 4
Startseite: 469
Seitenende: 473
Zusammenfassung: 
Transient absorption (TA) spectra and optical density relaxation kinetics in SrTiO3 (STO), STO-Nb and STO V were studied. The electron polaron free or bound at intrinsic defect is suggested to be responsible for the TA band at similar to1.4 eV observed in STO. The band peaking below 0.75 eV in STO-Nb is proposed to be from Nb4+. The electron center V3+ or electron polaron bound in the vicinity of V4+ is responsible for the absorption band at 1.0 eV in STO-V. The absorption from hole polarons is suggested to be in the range 1.8-2.3 eV. It is shown that TA in pure STO at room temperature decays due to electron-hole polaron recombination. (C) 2002 Elsevier Science B.V. All rights reserved.
ISSN: 0168583X
DOI: 10.1016/S0168-583X(02)00951-5

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