Abstract
Oxygen deficient Ga 2−2 x In 2 x O 3 (0≤ x≤0.5) solid solutions are investigated by means of optical absorption, fluorescence spectroscopies and electron spin resonance of conduction electrons. Optical spectroscopies show a decrease of the band gap when x increases. Electron spin resonance demonstrates that this phenomenon can be correlated to a progressive participation of indium orbitals in the conduction band edge. The predominant contribution of In-5s orbitals is responsible for a strong nuclear dynamic polarization, leading to the largest nuclear field B n=1.4 mT ever produced at high temperatures and low magnetic fields, for the composition with x=0.3. However, the expected bistability of the electron magnetic resonance resulting from this nuclear polarization is relatively small, most probably due to a disorder in the distribution of gallium and indium among the crystallographic sites. This disorder and the presence of Fe 3+ impurities is responsible for the variable magnetic properties of these compounds.
Published Version
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