Physics – Condensed Matter – Superconductivity
Scientific paper
2011-07-03
Physics
Condensed Matter
Superconductivity
Accepted for publication as a Rapid Communication in Physical Review B
Scientific paper
The nonmagnetic impurity effect is studied on the Fe-based BaFe1.89Co0.11As2 superconductor (Tc = 25 K) with Zn substitution for Fe up to 8 at. %, which is achieved by means of high-pressure and high-temperature heating. Tc decreases almost linearly with increasing the Zn content and disappears at ~8 atomic %, being different in the shared phenomenology of the early Zn doping studies, where Tc decreases little. The Tc decreasing rate, however, remains much lower (3.63 K/%) than what is expected for the s(+-)-wave model, implying the model is unlikely. Another symmetry model such as the non-sign reversal s-wave model may better account for the result.
Guo Yanfeng
Kontani Hiroshi
Li Jun
Takayama-Muromachi Eiji
Tsujimoto Yoshihiro
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