Mechanical method for experimental determination of the first-penetration field in high-temperature superconductors Articles uri icon

authors

  • DIEZ JIMENEZ, EFREN
  • PEREZ DIAZ, JOSE LUIS
  • GARCIA PRADA, JUAN CARLOS

publication date

  • October 2012

start page

  • 1

end page

  • 6

issue

  • 5 (9003106)

volume

  • 22

International Standard Serial Number (ISSN)

  • 1051-8223

abstract

  • In this paper, we propose a mechanical method to determine the first-penetration field Hp, in a bulk of a high-temperature superconductor. It consists in comparing measurement and numerical calculation of forces exerted between a magnet and the superconductor. The deviations between the measured forces and those calculated assuming the superconductor to be at the Meissner state are used to determine the maximum shielding current densities and, subsequently, the first-penetration field. This method allows comparison with other methods and seems to give good results. As an example, we apply it to an YBa2Cu3O7-x sample. In addition, we demonstrate that the transition occurs more easily when the magnet is over the borders than over the center.

keywords

  • first-penetration field measurement; high-temperature superconductor (hts) characterization; permanent-magnet-superconductor interaction; superconducting levitation