Periodic flux jump in superconducting Pb networks as consequence of the extended Little-Parks effect

Takekazu Ishida, Yoshiaki Matsushima, Makoto Shimizu, Masahiko Hayashi, Hiromichi Ebisawa, Osamu Sato, Masaru Kato, Tomio Koyama, Masahiko Machida, Kazuo Satoh, Tsutomu Yotsuya

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The extended Little-Parks effect of superconducting network is known as a periodic Tc variation as a function of magnetic field. Superconducting Pb honeycomb networks of matching field 0.106 G and triangular microhole lattice of Pb of matching field 0.425 G have been fabricated by the combination of electron-beam lithography and a lift-off process of evaporated Pb films. The application of magnetic field corresponds to the vortex filling into superconducting networks. We measured the magnetization of the networks systematically by using a SQUID magnetometer. We found that flux jump appears rather periodically as a function of magnetic field. Flux jumps may be induced by a periodic decrease of the critical current density of the network. To the authors' knowledge, this is for the first time to observe the regular flux jumps due to the critical current modification coming from the extended Little-Parks effect of the superconducting networks.

Original languageEnglish
Pages (from-to)576-580
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number7-10
Publication statusPublished - 2008 Apr 1
Externally publishedYes


  • Flux jump
  • Superconducting network
  • The Little-Parks effect

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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