Metallic clusters in nonstoichiometric gallium oxide films

Oxygen deficient gallium oxide films have been grown by pulsed-laser deposition. Depending on the growth conditions (oxygen pressure and laser power density), amorphous and insulating or partially crystalline and conducting gallium oxide films can be obtained. For very large oxygen deficiencies ( Ga...

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Bibliographic Details
Published in:Journal of applied physics 2011-01, Vol.109 (1), p.013711-013711-8
Main Authors: Petitmangin, Aline, Hébert, Christian, Perrière, Jacques, Gallas, Bruno, Binet, Laurent, Barboux, Philippe, Vermaut, Philippe
Format: Article
Language:English
Subjects:
Condensed Matter
Physics
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Summary:Oxygen deficient gallium oxide films have been grown by pulsed-laser deposition. Depending on the growth conditions (oxygen pressure and laser power density), amorphous and insulating or partially crystalline and conducting gallium oxide films can be obtained. For very large oxygen deficiencies ( Ga 2 O 2.3 ) , the oxide is not stable, and a phase separation leads to metallic Ga nanoparticles embedded in a stoichiometric Ga 2 O 3 matrix. The resistivity measurements evidence the melting and freezing of Ga metallic nanoparticles in addition to their superconducting transition at low temperature. Due to small size both transitions are shifted as compared to the bulk properties.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3531536