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Titolo:
Anisotropic photoionization as a mechanism of axial iron center alignment in KTaO3
Autore:
Basun, SA; Bursian, VE; Razdobarin, AG; Sochava, LS;
Indirizzi:
Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia Russian Acad Sci St Petersburg Russia 194021 t Petersburg 194021, Russia
Titolo Testata:
PHYSICS OF THE SOLID STATE
fascicolo: 6, volume: 43, anno: 2001,
pagine: 1059 - 1071
SICI:
1063-7834(200106)43:6<1059:APAAMO>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
INCIPIENT FERROELECTRIC KTAO3; TETRAGONAL FE-K(3+) CENTERS; ELECTRON-SPIN-RESONANCE; OPTICAL ALIGNMENT; FE CENTERS; PHOTOCONDUCTIVITY; REORIENTATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Basun, SA Russian Acad Sci, AF Ioffe Physicotech Inst, Politekhnicheskaya Ul 26, St Petersburg 194021, Russia Russian Acad Sci Politekhnicheskaya Ul 26 St Petersburg Russia 194021
Citazione:
S.A. Basun et al., "Anisotropic photoionization as a mechanism of axial iron center alignment in KTaO3", PHYS SOL ST, 43(6), 2001, pp. 1059-1071

Abstract

An EPR study has revealed light-induced recharging and optical alignment of the Fe-Ta(4+)-V-O tetragonal complexes in KTaO3. The data on the optical creation and destruction of this center by light of different polarizationsand wavelengths are discussed together with similar results obtained for the Fe-K(3+)-O-i center. These two centers were established to undergo mutual charge transfer, in which the electron released in the photoionization ofthe Fe-K(2+)-O-i center is trapped by the Fe-Ta(5+)-V-O center. Irradiation by light with a photon energy below 2.05 eV, which is the ionization threshold of Fe-K(2+)-O-i, reverses this process. In both cases, the absorptioncross section depends on the orientation of the center axis relative to the light polarization vector. As a result, the Fe-Ta(4+)-V-O and Fe-K(3+)-O-i tetragonal centers in KTaO3 acted upon by polarized light undergo orientation-sensitive light-induced recharging and the defects with the given charge state are no longer characterized by an equally probable distribution ofthe orientations of their axes over the three [100] directions. This mechanism, which does not involve real reorientations of the Fe-Ta-V-O and Fe-K-O-i complexes, gives rise, nevertheless, to the alignment of the centers along (or at right angles to) the light polarization vector. (C) 2001 MAIK "Nauka/Interperiodica".

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Documento generato il 21/09/20 alle ore 06:25:29