Effects of Zn and Mg in Cu sites ofYBa2Cu3O7−

Excess-conductivity of Nd0.1Y0.9Ba2Cu3O7−δ and Ca0.1Y0.9Ba2Cu3O7−δ superconductors: A quantitative comparison between results of aliovalent and isovalent substitutions in Y-site

“…The need to use this factor is attributed to the existence of an inhomogeneous current distribution, which arises from the morphologies and polycrystalline nature of our samples. Poor grain boundaries, disorder, and ambiguity in the distances between voltage contacts produce high C values [20][21][22]. Fig.…”

How the substitution of Zn for Cu destroys superconductivity in YBCO system?

“…The pairing and transportation of carriers are thus affected indirectly, and the superconductivity gets suppressed albeit slowly [1,6,11]. Mg ion, when doped, is known to occupy the Cu(1) chain as well as the Cu(2) sites leading to a higher rate of T c depression [12]. Other cations like Ni and Zn are said to primarily occupy the Cu(2) sites and hence are more detrimental to superconductivity.…”

Effects of Zn doping on YBaCuO superconductor

“…The impurities effects on the microstructural characteristics and the transport properties of high T c superconducting ceramics have been intensively investigated during the last decade [1][2][3]. It has been shown that Cu atoms can be partially replaced by other transition 3d-metal atoms, leading to unexpected changes in the properties such as superconducting transition temperatures, microstructure and densification in dependence on the nature of the substituted metal ions and the doping concentration [4][5][6].…”