Thermally induced oscillatory relaxation of dc resistivity and ac susceptibility in Y−Ba−Cu−O during N−S transition |
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| Authors: | A C Bódi I Kirschner S Leppävuori |
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| Institution: | (1) Institute of Experimental Physics, Kossuth University, P.O. Box 105, H-4001 Debrecen, Hungary;(2) Department for Low Temperature Physics, Eötrös University, Puskin u. 5-7, H-1088 Budapest, Hungary;(3) Microelectronics and Materials Physics Laboratories, University of Oulu, FIN-90570 Oulu, Finland |
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| Abstract: | Dc resistivity and ac susceptibility have been measured simultaneously on Y–Ba–Cu–O specimens under the effect of a temperature gradient. During cooling process, an intermediate (normal-superconducting) state of samples forms in the vicinity ofT
c
and an artificial, local, step-like change of temperature induces an oscillatory relaxation of the measured parameter. This phenomenon has been interpreted in the framework of a vortexglass model as a collective relaxation of vortices inside a domain volume defined by vortex-glass correlation length. Close to theT
c
the domain relaxation time and the correlation length have been determined as 51 s and 2 mm, respectively. |
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| Keywords: | 74 30-e 74 40 +k 74 60 Ge 74 70 Mq |
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