Microstructures of high-TC superconducting films introduced zero-dimensional and one-dimensional artificial pinning centers

Ataru Ichinose, Masashi Mukaida, Shigeru Horii, Ryusuke Kita, Kaname Matsumoto, Yutaka Yoshida

Research output: Contribution to journalArticlepeer-review

Abstract

Artificial pinning centers have been introduced into high-Tc superconducting films in order to improve the Jc at 77 K and magnetic fields. The dimensionality of artificial pinning centers has an important role in improving Jc against the magnetic field direction. The one-dimensional artificial pinning centers, such as dislocations and nanorods, are much effective on the B//c-axis. However, pinning centers with magnetic angular independences are much important for practical use. Then, a new concept of zerodimensional artificial pinning centers is applied to high-Tc superconducting films, which is local superconductivity disappearance resulting in the substitution of 3d-transit ion elements such as Zn or Co for Cu. We have no clear evidence of element substitution from microstructural observations. However, the magnetic field angular independences in a wide region except the B//a-axis are revealed in a Zn-doped film, which probably results form zero-dimensional pinning centers. Unexpected magnetic field angular dependences are also revealed, indicating the existence of other pinning centers except zero-dimensional pinning centers. It is found that unexpected defects, such as c-axis-correlated defects or stacking faults, are induced by 3d-transition element substitution.

Original languageEnglish
Pages (from-to)3701-3704
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
Publication statusPublished - Jun 1 2007

All Science Journal Classification (ASJC) codes

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

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