Transport critical current density and dimensional crossover in superconducting Nb/NbZr multilayers

T. Nojima, M. Kinoshita, S. Nakano, Y. Kuwasawa

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


In order to understand the nature of the mixed state, the critical current density Jc of Nb/NbZr multilayers was measured as a function of magnetic field H and of the angle between H and the film plane at the temperatures where the superconducting order parameter is localized in the Nb layers. In the parallel fields, which are perpendicular to the current J, the Jc-H curves show a peak at H=Hmax. The observed angular dependence of Jc below and above Hmax can be explained by the 3D stepwise vortex model and the 2D pancake vortex model, respectively. These results indicate that a dimensional crossover in the mixed state occurs at Hmax. This crossover may be the cause of the field dependence of Jc which is an increasing function of H below Hmax.

Original languageEnglish
Pages (from-to)387-392
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number3-4
Publication statusPublished - 1993 Feb 20
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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