Physics – Condensed Matter – Superconductivity
Scientific paper
2007-01-15
Nature Mater, 6, 224-229 (2007)
Physics
Condensed Matter
Superconductivity
23 pages, 3 figures, accepted for publication in Nature Materials
Scientific paper
10.1038/nmat1847
High-transition-temperature superconductivity arises in copper oxides when holes or electrons are doped into the CuO2 planes of their insulating parent compounds. While hole-doping quickly induces metallic behavior and superconductivity in many cuprates, electron-doping alone is insufficient in materials such as R2CuO4 (R is Nd, Pr, La, Ce, etc.), where it is necessary to anneal an as-grown sample in a low-oxygen environment to remove a tiny amount of oxygen in order to induce superconductivity. Here we show that the microscopic process of oxygen reduction repairs Cu deficiencies in the as-grown materials and creates oxygen vacancies in the stoichiometric CuO2 planes, effectively reducing disorder and providing itinerant carriers for superconductivity. The resolution of this long-standing materials issue suggests that the fundamental mechanism for superconductivity is the same for electron- and hole-doped copper oxides.
Ando Yoichi
Campbell Branton J.
Chupas Peter J.
Dai Pengcheng
Huang Qingzhen
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