Combined Optical/MCD/ODMR investigations of photochromism in doubly-doped Bi 12 GeO 20 |
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| Authors: | B Briat M T Borowiec H Bou Rjeily F Ramaz A Hamri H Szymczak |
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| Institution: | 1. Laboratoire d'Optique Physique , ESPCI , 10 rue Vauquelin, Paris Cedex 05 , 75231 , Fr;2. Institute of Physics , Polish Academy of Sciences , Al. Lotników 32/46, Warsaw , 02-668 , Pol |
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| Abstract: | Electron paramagnetic resonance is detected optically via the change of magnetic circular dichroism under microwaves at 35 v GHz. The technique is applied to Bi 12 GeO 20 samples co-doped with vanadium and a second transition metal (Cr, Mn, Co, Cu). The optical and magnetic properties of several paramagnetic defects (V Ge 4+ and Cr Ge 4+ ) are directly correlated. The basic photochromic processes occuring in samples doped with V, Mn, and Mn+V are explained. The V Ge 4+/5+ level is positioned roughly 2.2 v eV above the valence band. |
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| Keywords: | Bismuth Germanate Sillenite Magnetic Circular Dichroism Epr Photorefractive Photochromic |
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