Coexistence of superconductivity and magnetism in the La0.87−xLnxSr0.13FeAsO (Ln=Sm, Gd, Dy) system |
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Authors: | TP Lu |
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Institution: | Department of Physics, National Chung Hsing University, Taiwan, ROC |
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Abstract: | The interplay between the superconducting phase and spin density wave order phase was studied. We report the magnetic and superconducting properties of the hole-doped FeAs-based superconducting compound La0.87−xLnxSr0.13FeAsO (Ln=Sm, Gd, Dy; 0≤x≤0.06). Both resistivity and magnetic susceptibility measurements show that the superconducting transition temperature decreases with increase in composition of magnetic ions. The hysteresis loop of the La0.87−xLnxSr0.13FeAsO sample shows a superconducting hysteresis in addition to a paramagnetic background. The experiment demonstrates that the magnetism and superconductivity coexist in hole-doped FeAs-based superconducting compounds. Among these three magnetic rare-earth elements, the influence of Dy3+ doping on superconductivity is more evident than that of Gd3+ doping, while the influence of Sm3+ doping is the weakest. The trend is consistent with the variation of the lattice parameter along c-axis. |
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Keywords: | A Hole-doped superconductor A Iron-based superconductor D Paramagnetic D Spin density wave |
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