A Study on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Slightly Mn Added Bi-2223 Superconductor Ceramics
A Study on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Slightly Mn Added Bi-2223 Superconductor Ceramics
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DOI：
10.1007/s10948-012-1403-x
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发表时间：
2012-01
影响因子：
1.8
通讯作者：
M. Dogruer;Y. Zalaoglu;A. Varilci;C. Terzioglu;G. Yıldırım;O. Ozturk
中科院分区：
文献类型：
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作者：
M. Dogruer;Y. Zalaoglu;A. Varilci;C. Terzioglu;G. Yıldırım;O. Ozturk
通过磁阻测量，研究了在x=0、0.03、0.06、0.15、0.3和0.6的Bi1.8Pb0.4Sr2MnxCa2.2Cu3.0OyBand超导体中添加Mn对其超导性能和物理性能的影响。测量了用标准固相反应法制备的样品在不同外加磁场强度下的磁阻率。由磁阻曲线推算出样品的零电阻转变温度(TC)、不可逆场(μ0Hirr)和上临界场(μ0Hc2)等超导和物理性质。此外，还研究了热激活磁通蠕变模型对样品的活化能(U0)的影响。根据测量结果，不仅样品的TandU0值显著降低，而且μ0Hirrandμ0Hc2值也随着Mn加入量的增加而减小，表明掺杂降低了样品的物理和超导性能。
This study discusses the effect of Mn addition on the superconducting and physical properties in Bi1.8Pb0.4Sr2MnxCa2.2Cu3.0Oybulk superconductors withx=0,0.03,0.06,0.15,0.3, and 0.6 by means of the magnetoresistivity measurements. The magnetoresistivity of the samples prepared using the standard solid-state reaction method was measured for different values of the applied magnetic field strengths. The superconducting and physical properties of the samples such as the zero resistivity transition temperatures (Tc), irreversibility fields (μ0Hirr), and upper critical fields (μ0Hc2) were deduced from the magnetoresistivity curves. Moreover, thermally activated flux creep model was studied for activation energy (U0) values of the samples. According to the results of the measurements, not only were theTcandU0values of the samples found to decrease significantly but theμ0Hirrandμ0Hc2values were also observed to reduce with the increase in the Mn addition, indicating that the doping degrades the physical and superconducting properties of the samples.