THE POSSIBILITY OF LI+ OFF-CENTER ION TUNNELING IN K1-XLIXTAO3 STUDIED BY 2ND-HARMONIC GENERATION

Autor(en): VIKHNIN, V
VOIGT, P
KAPPHAN, S
Stichwörter: ELECTRIC-FIELD; GLASS; K0.989LI0.011TAO3; Physics; Physics, Condensed Matter; RELAXATION
Erscheinungsdatum: 1995
Herausgeber: IOP PUBLISHING LTD
Journal: JOURNAL OF PHYSICS-CONDENSED MATTER
Volumen: 7
Ausgabe: 36
Startseite: 7227
Seitenende: 7238
Zusammenfassung: 
Time-dependent second-harmonic generation experiments in K1-xLixTaO3 crystals for the first time yield a Li concentration dependence of the activation energy of the Arrhenius-like reorientation process of the Li+ ions. The experimental data support the assumption of a Li+ off-centre ion tunnelling via excited and ground vibrational states. With increasing Li concentration, the tunnelling reorientation is Suppressed in favour of a thermally activated over barrier hopping. The suppression of the tunnelling reorientation can be explained by a model of cooperative tunnelling in a percolation dipole cluster and destruction of the tunnelling resonance condition by internal electric dipole fields.
ISSN: 09538984
DOI: 10.1088/0953-8984/7/36/012

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