We demonstrated extreme hole reduction and electron accumulation in YBa2Cu3Oy films by an electrochemical technique. Following the transition from superconductor to insulator, we succeeded in doping electrons as evidenced by the decrease in resistivity and sign change of the Hall coefficient. Further doping resulted in metallic n-type YBa2Cu3Oy with a carrier density of ∼2.5 × 1020 cm-3, but without any sign of superconductivity. The oxygen vacancies electrochemically induced in the CuO2 planes played a major role in the p-n transition.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2011 7 11|
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