Intergranular critical currents and excess conductivity in the Fe-substituted Bi-2223 high Tc superconductor |
| |
Authors: | A Harabor A V Pop R Deltour J Schroeder D Ciurchea Gh Ilonca |
| |
Affiliation: | (1) Physique des Solides, Université Libre de Bruxelles, Campus Plaine, CP 233, D-1050 Bruxelles, Belgium;(2) Faculty of Physics, University Babes-Bolyai, 3400 Cluj-Napoca, Romania |
| |
Abstract: | In this paper me present the effect of iron substitution in the (Bi1.6Pb0,4)(Sr1.88Ba0.2)Ca2(Cu1–xFex)3.1Oy system. From the resistivity and AC susceptibility data we observed that a monotonie decrease of Tc occurs with increasing Fe concentration. A strong reduction of Jc (calculated from AC susceptibility data performed at low magnetic fields in the range 0.4A/m-800A/m) is observed in the doped samples. The crossover temperature from the Anderson-Kim thermally activated flux creep to the thermally activated phase slippage behaviour is depending on the doping concentration. The excess conductivity and 2D-3D crossover is well described by considering ![Delta](/content/kv185556727ng786/xxlarge916.gif) / 0 as a product of a Gaussian centered at Tc with a Student distribution centered at 2Tc. The alteration of 2D dimensionality above Tc by doping results in the decrease of the number of freedom degrees of the Student distribution. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|