Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
نویسندگان
چکیده
We report Zn-doping effect in the parent and F-doped LaFeAsO oxyarsenides. Slight Zn doping in LaFe1−xZnxAsO drastically suppresses the resistivity anomaly around 150 K associated with the antiferromagnetic (AFM) spin density wave (SDW) in the parent compound. The measurements of magnetic susceptibility and thermopower confirm further the effect of Zn doping on AFM order. Meanwhile Zn doping does not affect or even enhances the Tc of LaFe1−xZnxAsO0.9F0.1, in contrast to the effect of Zn doping in high-Tc cuprates. We found that the solubility of Zn content (x) is limited to less than 0.1 in both systems and further Zn doping (i.e., x ≥ 0.1) causes phase separation. Our study clearly indicates that the nonmagnetic impurity of Zn ions doped in the Fe2As2 layers affects selectively the AFM order, and superconductivity remains robust against the Zn doping in the F-doped superconductors. PACS numbers: 74.70.Dd, 74.62.Dh, 74.25.Fy, 74.25.Ha † Electronic address: [email protected] ‡ Electronic address: [email protected] Effect of Zn doping on magnetic order and superconductivity in LaFeAsO 2
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