Effect of Blocking and Superconducting Layer Doping on the Superconductivity and Magnetic Properties of Polycrystalline Sr2CaCu2O6 |
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| Authors: | A. Sklyarova S. Shinoda T. Nagumo V. I. Chizhik V. V. Matveev J. Lindén R. Pohjonen T. Suzuki T. Nakayama H. Suematsu |
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| Affiliation: | 1.Extreme Energy-Density Research Institute,Nagaoka University of Technology,Nagaoka,Japan;2.St. Petersburg State University,St. Petersburg,Russia;3.Department of Physics,?bo Akademi,Turku,Finland;4.Department of Nuclear System Safety Engineering,Nagaoka University of Technology,Nagaoka,Japan |
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| Abstract: | The possible difference in the properties upon doping the Sr2CaCu2O6 superconducting or blocking layers with Fe and Eu respectively was investigated in this work. The homogeneous Sr2?yEuyCaCu2O6+δ and Sr2CaCu2?xFexO6+δ (y = 0, 0.1, 0.5, x = 0, 0.05) compounds were produced by a high-pressure synthesis route. Judging by the magnetic susceptibility measurements, all samples exhibit a superconductivity transition and the Eu/Fe concentration dependencies on the diamagnetic moment and average Tc have been constructed using the experimental data. As a result, an unusual behavior of the Tc value was observed for the samples with doped Eu: a fivefold reduction in the europium concentration in the sample does not give a noticeable effect on the transition temperature value while the diamagnetic signal becomes more stronger. Complex superconducting dome was found for Eu-doped material: 0.1 ≤ y ≤ 0.5 region Tc vs. concentration data were approximated by inverted parabola-like curve with a maximum at y = 0.3. Difference in properties of the Eu and Fe-doped samples was also found in the behavior of the hysteresis loops showed the opposite orientations. |
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