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首页> 外文期刊>Applied Magnetic Resonance >Magnetically modulated microwave absorption study of superconducting MgB2 regions
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Magnetically modulated microwave absorption study of superconducting MgB2 regions

机译：MgB2超导区域的磁调制微波吸收研究

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摘要

Experiments on thin MgB2 films synthesized by ion implantation followed by hydrogen-plasma pulse treatment or annealing the sample at a given temperature in a furnace were undertaken. Superconducting properties were examined by magnetically modulated microwave absorption (MMMA) measurements. MMMA was measured as a function of temperature and external magnetic field in differently prepared MgB2 samples. The results show the existence of superconducting regions with critical temperatures dependent on the recrystallization conditions. The MMMA dependence on the magnetic field sweep is very sensitive to the morphology of the sample and reveals variations in the quality of the superconducting material. The samples studied exhibit signals with different widths and hysteresis properties. Such behavior is analyzed in terms of a model of Josephson junctions at narrow regions within an imperfect film of MgB2 and flux pinning in superconducting regions. The amplitude of the MMMA signal at a given T < T-c scales with the volume fraction of the superconducting material only if the hysteresis has the same looplike shape.
机译：进行了通过离子注入，氢等离子体脉冲处理或在给定温度下在炉中对样品进行退火而合成的MgB2薄膜的实验。通过磁调制微波吸收（MMMA）测量来检查超导性能。在不同制备的MgB2样品中，测量MMMA作为温度和外部磁场的函数。结果表明临界温度取决于再结晶条件的超导区域的存在。 MMMA对磁场扫描的依赖性对样品的形态非常敏感，并揭示了超导材料质量的变化。研究的样本显示出具有不同宽度和磁滞特性的信号。根据不完善的MgB2膜内狭窄区域的约瑟夫森结模型和超导区域的通量钉扎分析了这种行为。仅在磁滞具有相同的环状形状时，在给定的T

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