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Article
Vibration effect on magnetization and critical current density of superconductors
Superconductor Science and Technology (2016)
  • Igor Golovchanskiy
  • Alexey V Pan, University of Wollongong
  • Jonathan George
  • Frederick S Wells
  • Sergey Fedoseev, University of Wollongong
  • Anatoly Rozenfeld, University of Wollongong
Abstract
In this work the effect of vibrations on critical current density (J c ) of superconductors has been studied. The vibrations are shown to affect J c of all types of superconductors during their measurements, employing a vibrating sample magnetometer (VSM). Increasing vibration frequency (f) and/or amplitude (A) leads to progressive reduction of J c as a function of magnetic field (B a ). The effect of vibrations is substantially stronger in thin films. It leads to development of unexpected kinks on  curves. Analysis of magnetization loops and relaxation of magnetization in YBCO films revealed that the vibration effect can be treated as the effective reduction of pinning potential. The asymmetry of the vibration effect in ascending and descending B a is observed, indicating differences in free energy of the corresponding vortex structures. Thermal effects induced by vibrations with large f and A are shown to have rather insignificant influence, while the vibrational vortex dynamics exhibit a strong impact. The irreversibility field () is shown to be instrumentally defined, and its value depends on VSM settings. In addition, the practical importance of  for J cmodeling is demonstrated.
Keywords
  • Superconductivity,
  • Measurement Errors,
  • Vibrating Sample Magnetometry
Publication Date
Spring May 17, 2016
DOI
http://dx.doi.org/10.1088/0953-2048/29/7/075002
Citation Information
Igor Golovchanskiy, Alexey V Pan, Jonathan George, Frederick S Wells, et al.. "Vibration effect on magnetization and critical current density of superconductors" Superconductor Science and Technology Vol. 29 Iss. 7 (2016) p. 075002
Available at: http://works.bepress.com/frederick_wells/7/