An EPR study of different Gd3+ centers in LiNbO3 |
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| Authors: | B Dischler JR Herrington A Räuber J Schneider W Urban |
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| Institution: | Institut für Angewandte Festkörperphysik der Fraunhofer-Gesellschaft, D-78 Freiburg, Germany (BRD);Institut für Angewandte Physik der Universität, D-53 Bonn, Germany (BRD) |
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| Abstract: | Electron Paramagnetic Resonance (EPR) and Zero-(magnetic)-Field (paramagnetic) Resonance (ZFR) spectra have been observed for LiNbO3:Gd. EPR spectra measured at 9 and 35 GHz consisted of at least seven independent patterns; all of predominantly axial symmetry and all ascribed to Gd3+. The two most intense patterns have been analyzed in detail, and while one was found to be axially symmetric the other, though predominantly axial, had a small rhombic crystal field term. The ZFR spectrum, measured between 1 and 18 GHz, consisted of at least two patterns of zero field transitions. Both EPR and ZFR spectra were found to be insensitive to variations in LiNbO3 stoichiometry, c- of a-axis crystal growth direction, and various sample treatments. |
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