Striking Zn impurity effect on the Fe-based superconductor BaFe1.87Co0.13As2

Authors :: Li, J. J.
Guo, Y. F.
Zhang, S. B.
Yu, S.
Tsujimoto, Y.
Yamaura, K.
Takayama-Muromachi, E.
Publication Year :: 2010
Abstract: Nonmagnetic impurity effect was studied on the n-type Fe-based superconductor BaFe1.87Co0.13As2 (Tc = 25 K) by a successful Zn substitution for Fe up to 7 at.%. Magnetic susceptibility, electrical resistivity, specific heat, and Hall coefficient measurements indicated that Tc linearly decreases with the Zn concentration and disappears at 7 at.%. The result is quantitatively comparable with what was observed for YBCO, while it disagrees with a recent report for the p-type Ba0.5K0.5Fe2As2. Fragile SC against a nonmagnetic impurity was first confirmed for the n-type 122 Fe-based superconductor.<br />14 pages, 5 figures