Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/70274
標題: Fluctuation conductivity and upper critical field of Y1-xRExNi2B2C (RE = Er, Ho, Dy, Gd) superconductors
作者: Lan, M.D.
Chang, J.C.
Lee, C.Y.
關鍵字: single-crystals
magnetic-field
transport
transition
期刊/報告no:: Journal of Physics and Chemistry of Solids, Volume 61, Issue 12, Page(s) 2035-2041.
摘要: We have investigated the upper critical fields of Y1-xRExNi2B2C (RE = Er, Ho, Dy, Gd; 0 less than or equal to x less than or equal to 1) compounds by using the scaling analysis of the thermal fluctuation conductivity. The thermal fluctuation conductivity can be scaled by a universal function both above and below the mean-field transition temperature for all magnetic fields. A positive curvature is present in H-c2(T). The upward curvature of the H-c2(T) curve in the Y1-xRExNi2B2C system might suggest an intrinsic anomalous pairing mechanism. Based on the value of upper critical field near T-c, the superconducting coherence length is estimated at 6.4 nm for an x = 0 sample. The Ginzburg-Landau parameter kappa estimated is similar to 11 in the pristine YNi2B2C system. (C) 2000 Elsevier Science Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/70274
ISSN: 0022-3697
文章連結: http://dx.doi.org/10.1016/s0022-3697(00)00203-1
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