I. V. Zhuvagin, V. A. Vlasenko, A. S. Usoltsev, A. A. Gippius, K. S. Pervakov, A. R. Prishchepa, V. A. Prudkoglyad, S. Yu. Gavrilkin, A. D. Denishchenko, A. V. Sadakov
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引用次数: 0
摘要
我们报告了最近发现的 12442 族高温超导体的两个成员的合成，它们的化学式为 MCa2Fe4As4F2（M=Rb，K），转变温度分别为 32.7 K 和 34.6 K。利用 X 射线粉末衍射评估了样品的质量，并通过传输和磁性实验确定了超导转变。在高达 19 T 的磁场下，研究了上临界磁场和涡旋活化能的温度依赖性。活化能 U0(H)的磁场依赖性表明，在这些情况下，涡旋物质的性质发生了变化，耗散机制也截然不同，这让人联想到杯状 HTSC。
Synthesis and Properties of 12442-family Superconductor
We report a synthesis of two members of recently discovered high-temperature superconductors of 12442 family, with formula MCa2Fe4As4F2 (M=Rb, K) and transition temperatures of 32.7 and 34.6 K, respectively. Quality of the samples was assessed using X-ray powder diffraction, superconducting transitions were identified through transport and magnetic experiments. The temperature dependence of the upper critical field and vortex activation energy was investigated under magnetic fields up to 19 T. Two distinct thermally activated flux flow regimes were observed in both systems. Field dependences of activation energy U0(H) indicate a change in the properties of vortex matter in these regimes and distinctly different dissipation mechanisms, reminiscent of cuprate HTSC.
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All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
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