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- W2163109538 abstract "Substituting Zn for Cu is known to rapidly quench superconductivity in the doped perovskites but the mechanism behind it is still not clearly understood. Single phase YBa 2 ( Cu 1-x Zn x ) 3 O 7-δ (x = 0.0 to 0.06) samples were synthesized and characterized using XRD, wet titration, resistivity, and ac susceptibility. Angle-integrated Valence Band Photoemission and Zn K-edge XAFS results clearly show that their oxygen stoichiometry (δ) changes on Zn substitution, thereby adversely affecting the density of free charge carriers and hence the normal state resistivity and the T c . However, the observed changes in the two happen to be too large to be accounted for solely on the basis of changes in the oxygen stoichiometry δ. We find that the Zn cation acts as a strong impurity scattering centre in the YBCO lattice and causes local lattice distortion (LLD). It consequently induces local magnetic moment, seen in our dc susceptibility measurements. It is thus a composite of (Δδ), LLD and possibly also magnetic pair-breaking that is responsible for the rapid quenching of the superconductivity observed with Zn doping in this system." @default.
- W2163109538 created "2016-06-24" @default.
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- W2163109538 date "2010-06-10" @default.
- W2163109538 modified "2023-09-27" @default.
- W2163109538 title "MECHANISM OF QUENCHING OF SUPERCONDUCTIVITY IN THE YBa2Cu3O7-δ SYSTEM ON SUBSTITUTION OF Zn FOR Cu" @default.
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- W2163109538 doi "https://doi.org/10.1142/s0217979210055342" @default.
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