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 journalArticle

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

Fingerprint

Superconducting films
superconducting films
Magnetic fields
microstructure
Microstructure
Substitution reactions
Transition Elements
Defects
Stacking faults
substitutes
Superconductivity
Nanorods
magnetic fields
Ions
defects
transit
crystal defects
nanorods
superconductivity
transition metals

All Science Journal Classification (ASJC) codes

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

Cite this

Microstructures of high-TC superconducting films introduced zero-dimensional and one-dimensional artificial pinning centers. / Ichinose, Ataru; Mukaida, Masashi; Horii, Shigeru; Kita, Ryusuke; Matsumoto, Kaname; Yoshida, Yutaka.

In: IEEE Transactions on Applied Superconductivity, Vol. 17, No. 2, 01.06.2007, p. 3701-3704.

Research output: Contribution to journalArticle

Ichinose, Ataru ; Mukaida, Masashi ; Horii, Shigeru ; Kita, Ryusuke ; Matsumoto, Kaname ; Yoshida, Yutaka. / Microstructures of high-TC superconducting films introduced zero-dimensional and one-dimensional artificial pinning centers. In: IEEE Transactions on Applied Superconductivity. 2007 ; Vol. 17, No. 2. pp. 3701-3704.
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