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

Tsutomu Nojima, Taisuke Masuda, Shigeru Nakano, Yoshinori Kuwasawa

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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 Δ(r) from Nb to NbZr layers. In order to understand the behavior of the localized Δ(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 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.

本文言語English
ホスト出版物のタイトルProceedings of SPIE - The International Society for Optical Engineering
出版社Publ by Society of Photo-Optical Instrumentation Engineers
ページ312-319
ページ数8
ISBN(印刷版)0819414522, 9780819414526
DOI
出版ステータスPublished - 1994
外部発表はい
イベントSuperconducting Superlattices and Multilayers - Los Angeles, CA, USA
継続期間: 1994 1月 241994 1月 25

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
2157
ISSN(印刷版)0277-786X

Other

OtherSuperconducting Superlattices and Multilayers
CityLos Angeles, CA, USA
Period94/1/2494/1/25

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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