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Magnetic effect from non-magnetic impurity in superconducting

$\chem{CuO_{2}}$

plane

Author： Loktev V. M. Pogorelov Yu. G.

Publisher： Edp Sciences

E-ISSN： 1286-4854|60|5|757-763

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.60, Iss.5, 2010-03, pp. : 757-763

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

We propose a new model of impurity center formed by a cathionsubstitute for $\chem{Cu}$, like $\chem{Zn}$, in $\chem{CuO_{2}}$planes. Its main effect on superconducting electrons is due to thenon-zero exchange field on $\chem{O}$ sites, neighbors to(non-magnetic) impurity. We discuss a strong suppression of thed-wave order parameter, a zero-energy resonance in the localdensity of states, and spin polarization of charge carriers,which can be related to the experimentally observed effects in$\chem{Zn}$-doped copper oxides. These results are obtainedwithout using the widely accepted unitary scatteringlimit.

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