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Proceedings Paper

New phase line in the mixed state of Nb/NbZr multilayers
Author(s): Tsutomu Nojima; Taisuke Masuda; Shigeru Nakano; Yoshinori Kuwasawa
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Paper Abstract

The superconducting multilayer Nb/NbZr is known to show an upturn feature in the parallel upper critical field Hc2(T) at a characteristic temperature T+ with decreasing T. This phenomenon occurs due to the change of the position for nucleation of order parameter (Delta) (r) from Nb to NbZr layers. In order to understand the behavior of the localized (Delta) (r) in the mixed state, we have measured the critical current density Jc of Nb/NbZr as a function of H and of angle between H and film plane. In this system, the peak effect has been reported in Jc(H) above T+ by previous work. In this work, besides this peak, two kinds of kink structures in Jc(H) are observed at fields HL1 and HL2 only in the temperatures above T+.HL1(T) and HL2(T) are plotted around the extrapolated line from Hc2(T) above T+. From the field dependence of the angular derivative of Jc and the discussion about the free energy in the system, we will show the possibility of the phase transition at these characteristic fields.

Paper Details

Date Published: 29 June 1994
PDF: 8 pages
Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); doi: 10.1117/12.179166
Show Author Affiliations
Tsutomu Nojima, Chiba Univ. (Japan)
Taisuke Masuda, Chiba Univ. (Japan)
Shigeru Nakano, Chiba Univ. (Japan)
Yoshinori Kuwasawa, Chiba Univ. (Japan)

Published in SPIE Proceedings Vol. 2157:
Superconducting Superlattices and Multilayers
Ivan Bozovic, Editor(s)

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