Abstract
Effects of high valence ions V 4+ and Ni 3+ substitution on superconductivity are studied systematically for the electron-doped superconducting Pr 1.85Ce 0.15CuO 4− δ (PCCO) system. The results indicate that very small amount of V 4+ substitution ( x ⩽ 0.04) for Cu 2+ site improves the superconductivity, but further substitution ( x ⩾ 0.06) will depress the superconductivity. Contrasting with V 4+, Ni 3+ substitution shows a strong suppression on superconductivity, even for extremely small amount substitution of 0.01. Both the change of lattice parameters and the similar 3d electron structure of V 4+ ion to the Cu 2+ ion support the improvement of superconductivity while x ⩽ 0.04 in the V-substituted PCCO system. The results of Hall effect indicate that high valence ion substitution for Cu 2+ increase the carrier concentration, which is also one reason for the improvement of superconductivity of V 4+ substitution PCCO.
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