New phase line in the mixed state of Nb/NbZr multilayers

Tsutomu Nojima; Taisuke Masuda; Shigeru Nakano; Yoshinori Kuwasawa

doi:10.1117/12.179166

29 June 1994 New phase line in the mixed state of Nb/NbZr multilayers

Tsutomu Nojima, Taisuke Masuda, Shigeru Nakano, Yoshinori Kuwasawa

Proceedings Volume 2157, Superconducting Superlattices and Multilayers; (1994) https://doi.org/10.1117/12.179166
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The superconducting multilayer Nb/NbZr is known to show an upturn feature in the parallel upper critical field H_c2(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 J_c 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 J_c(H) above T⁺ by previous work. In this work, besides this peak, two kinds of kink structures in J_c(H) are observed at fields H_L1 and H_L2 only in the temperatures above T⁺.H_L1(T) and H_L2(T) are plotted around the extrapolated line from H_c2(T) above T⁺. From the field dependence of the angular derivative of J_c and the discussion about the free energy in the system, we will show the possibility of the phase transition at these characteristic fields.

Citation Download Citation

Tsutomu Nojima, Taisuke Masuda, Shigeru Nakano, and Yoshinori Kuwasawa "New phase line in the mixed state of Nb/NbZr multilayers", Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); https://doi.org/10.1117/12.179166

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