Abstract
We study the effect of nonmagnetic Zn impurity on superconductivity in the LaFe1−yZnyPO0.94F0.06 system by measuring the transport and magnetic properties. It is found that Zn doping drastically suppresses the superconducting transition temperature Tc. This is consistent with the theoretic prediction in the scenario of s±-wave or d-wave pairing.
Highlights
Since discovery of high-Tc superconducting (SC) cuprates, the superconducting pairing symmetry has become one of the key issues to understand the SC mechanism in unconventional superconductors as well as in the recently-discovered iron-based superconductors.[1]
Our data suggest that the SC order parameter in LaFe1−yZnyPO0.94F0.06 system could have a sign-reversing s±-wave or d-wave pairing symmetry
The main X-ray diffraction (XRD) peaks can be well indexed based on a tetragonal cell with the space group of P4/nmm, which indicates that the samples are essentially single phase
Summary
Since discovery of high-Tc superconducting (SC) cuprates, the superconducting pairing symmetry has become one of the key issues to understand the SC mechanism in unconventional superconductors as well as in the recently-discovered iron-based superconductors.[1]. In d-wave pairing superconductors, even a non-magnetic impurity will severely suppress Tc due to the sign change of the SC order parameter on a Fermi surface. Such a pair-breaking effect induced by nonmagnetic impurities has been observed in the high-Tc cuprates which have the nodal d-wave pairing symmetry.[3]. Our data suggest that the SC order parameter in LaFe1−yZnyPO0.94F0.06 system could have a sign-reversing s±-wave or d-wave pairing symmetry
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