Intrinsic Josephson Junctions and their Characteristics in Bi-Based High-Temperature Superconductors

Minoru Suzuki, Shin Ichi Karimoto, Takao Watanabe, Azusa Matsuda

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Abstract

In the Bi2Sr2CaCu2O8 + δ high-temperature superconductor system, which has a layered crystal structure and very large anisotropy, the superconducting layers are coupled by the Josephson effect and the crystal itself naturally makes a stack of Josephson tunnel junctions in series, called intrinsic Josephson junctions. Associated with such a layered strucure of the intrinsic Josephson junctions, heating due to current injection is significant. In order to observe their tunneling characteristics, it is necessary to fabricate very thin and small samples and thereby reduce the heating due to current injection. We have fabricated such very thin samples and observed tunneling characteristics of the intrinsic Josephson juncitons. The observed current-voltage characteristics and the gap voltage are very different from those of conventional superconductors. They can be explained in terms of the symmetry of the superconducting order parameter and the evolution of a pseudogap.

Original languageEnglish
Pages (from-to)1001-1006
Number of pages6
JournalNTT R and D
Volume47
Issue number9
Publication statusPublished - 1998 Dec 1

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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