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標題: Upper critical field of borocarbide superconductors
作者: Lan, M.D.
Chang, J.C.
Lu, K.T.
Lee, C.Y.
Shih, H.Y.
Jeng, G.Y.
關鍵字: upper critical field;magnetoresistivity;resistivity measurement;superconducting materials;magnetic-field;system
Project: Ieee Transactions on Applied Superconductivity
期刊/報告no:: Ieee Transactions on Applied Superconductivity, Volume 11, Issue 1, Page(s) 3607-3610.
We have investigated the upper critical fields of Y1-xErxNi2B2C and Y1-xErxPd5B3C0.4 (0 less than or equal to x less than or equal to 1) systems by the scaling analysis of the thermal fluctuation conductivity, The experiments were done over wide magnetic field range. We are going to test the thermal fluctuation theory in the borocarbide superconducting systems. According to the scaling analysis, the thermal fluctuation conductivity should be scaled as sigma (f) = (T-2/H)(1/3) F[AT-T-c(H)/(TH)(2/3)]. Because the scaling function is field independent, all scaling curves obtained under various applied fields should converge to a universal curve if the function of T,(H) is properly chosen. We therefore obtain H-c2(T) determined by optimizing the scaling fit, The superconducting coherence length and Ginzburg-Landau parameter kappa in those superconductors are also estimated. We categorize the Y1-xErxNi2B2C and Y1-xErxPd5B3C0.4 systems as strong type-II superconductors.
ISSN: 1051-8223
DOI: 10.1109/77.919845
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