Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-15
Physical Review B 82,054506 (2010)
Physics
Condensed Matter
Superconductivity
latest update
Scientific paper
10.1103/PhysRevB.82.054506
We observed a large decrease of Tc by no more than 3 at.% of Zn doped to the optimized superconductor LaFeAsO0.85 (Tc = 26 K), confirmed by measurements of electrical resistivity, magnetic susceptibility, specific heat, M\"ossbauer spectroscopy, Hall coefficient, and an electron probe micro-analysis. The rate ~9 K/% is remarkably higher than observations regarding nonmagnetic impurities. The Tc suppression is likely due to pair-breaking caused by scatterings associated with highly localized electronic state of Zn doped into the Fe2As2 layer. If this is true, the Zn result well accords with the theoretical prediction that suggests a sign reversal s-wave pairing model for the Fe pnictide superconductors, unlike other nonmagnetic impurity results.
Awana* V. P. S.
Belik Alexei A.
Felner Israel
Guo Y. F.
Katsuya Y.
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