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Investigation of the bulk pinning force in YBCO superconducting films with nano-engineered pinning centres
Tekijät: Crisan A., Dang V., Yearwood G., Mikheenko P., Huhtinen H., Paturi P.
Kustantaja: Elsevier
Julkaisuvuosi: 2014
Journal: Physica C: Superconductivity and its Applications
Tietokannassa oleva lehden nimi: Physica C: Superconductivity and its Applications
Vuosikerta: 503
Aloitussivu: 89
Lopetussivu: 93
Sivujen määrä: 5
ISSN: 0921-4534
DOI: https://doi.org/10.1016/j.physc.2014.03.028
Verkko-osoite: http://api.elsevier.com/content/abstract/scopus_id:84904387884
Tiivistelmä
For practical applications of superconducting materials in applied magnetic fields, artificial pinning centres in addition to natural ones are required to oppose the Lorentz force. These pinning centres are actually various types of defects in the superconductor matrix. The pinning centres can be categorised on their dimension (volume, surface, or point) and on their character (normal cores or Δκ cores). We have used the Dew Hughes approach to determine the types of pinning centres present in various samples, with various thicknesses, temperatures and nanostructured additions to the superconducting matrix. Results show that normal surface pinning centres are present throughout almost all the samples, as dominant pinning mechanism. Such 2D extended pinning centres are mainly due to dislocations, grain boundaries, nanorods. Strong normal point pinning centres were found to be common in BZO doped YBCO samples. Other types of pinning centres, in various (minor) concentrations were also found in some of the samples. © 2014 Elsevier B.V. All rights reserved.
For practical applications of superconducting materials in applied magnetic fields, artificial pinning centres in addition to natural ones are required to oppose the Lorentz force. These pinning centres are actually various types of defects in the superconductor matrix. The pinning centres can be categorised on their dimension (volume, surface, or point) and on their character (normal cores or Δκ cores). We have used the Dew Hughes approach to determine the types of pinning centres present in various samples, with various thicknesses, temperatures and nanostructured additions to the superconducting matrix. Results show that normal surface pinning centres are present throughout almost all the samples, as dominant pinning mechanism. Such 2D extended pinning centres are mainly due to dislocations, grain boundaries, nanorods. Strong normal point pinning centres were found to be common in BZO doped YBCO samples. Other types of pinning centres, in various (minor) concentrations were also found in some of the samples. © 2014 Elsevier B.V. All rights reserved.
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