Perturbed Angular Correlation Studies in SrTi0₃ Single Crystals



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Presa Muñoz del Toro, Patricia de la and Lieb, K. P. and Uhrmacher, M. and Ziegeler, L. (2000) Perturbed Angular Correlation Studies in SrTi0₃ Single Crystals. Zeitschrift fur naturforschung section a-a journal of physical sciences, 55 (1-fe). pp. 237-241. ISSN 0932-0784

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The quadrupole hyperfine interactions of ^111Cd/^111 probe nuclei in single-crystalline SrTiO₃ perovskite samples were investigated using Perturbed Angular Correlation spectroscopy. Three electric field gradients were detected and their fractions and hyperfine parameters were measured in the temperature range from 26 to 700 K. The fraction f₀ having a vanishing quadrupole frequency, as expected for ^111Cd on substitutional sites in a cubic lattice, starts to develop around 300 K and reaches 100% at 700 K. Two well-defined EFG's having closely lying quadrupole frequencies and asymmetry parameters of ω_(Q1) = 49.1(3) Mrad/s, η_(1) = 0.10(2) and ω_(Q2) = 51 8(3) Mrad/s, η_(2)= 0.12(2), at room temperature, were identified in the temperature range from 250 to 530 K, and their (100) orientation in the lattice was determined. They are associated with electronic defects at the probe atoms.

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© Verlag der Zeitschrift für Naturforschung.
International Symposium on Nuclear Quadrupole Interactions (XVth NQI 99) (15. 1999. Leipzig, Germany).
This work has been supported by the Deutsche Forschungsgemeinschaft, Bonn.

Uncontrolled Keywords:Electric-field gradients; Correlation spectroscopy; Hyperfine interactions; ^111Cd; Relaxation; Defects; Oxides; Pac
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:45626
Deposited On:04 Dec 2017 12:36
Last Modified:04 Dec 2017 12:36

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