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Rectifying differences in transport, dynamic, and quasi-equilibrium measurements of critical current density

Journal Article


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Abstract


  • The dependence of the critical current density (Jc) on electric field criteria (Ecr) is studied for high-quality YBCO (YBa 2Cu3O7) thin films over the entire applied magnetic field (Ba) range. The quantitative model describing the J c (B a) dependence is compared and explained for the critical current densities obtained by different measurement techniques. Transport current and quasi-equilibrium magnetization measurement data can successfully be fitted by the model with appropriate electric field criteria. The dependence of the irreversibility field on the Ecr criterion can be obtained within the model. At the same time, the dynamic magnetization measurements of the J c (B a) curves strongly depend on instrumentally defined parameters, introducing inconsistencies in the experimental results. Therefore, the model calculations are able to explain the J c (B a) curves only if the instrumental vibrations affecting vortex behaviour are taken into account. However, the nature of the observed dependence on the vibration of the samples is unclear. Different frequencies of the sample vibrations have been investigated. It is revealed that if the frequency tends to zero, the J c (B a) curves are well described by the model. We have outlined a number of possibilities which may be responsible for the behaviour observed. However, none of the existing theories can explain the effect of the vibrations, which exponentially degrade the irreversibility field to a certain tampered Birr value at frequencies larger than ≃ 25 Hz.

UOW Authors


  •   Golovchanskiy, Igor A. (external author)
  •   Pan, Alexey
  •   Shcherbakova, Olga V. (external author)
  •   Fedoseev, Sergey (external author)

Publication Date


  • 2013

Citation


  • Golovchanskiy, I. A., Pan, A. V., Shcherbakova, O. V. & Fedoseev, S. (2013). Rectifying differences in transport, dynamic, and quasi-equilibrium measurements of critical current density. Journal of Applied Physics, 114 (16), 163910-1-163910-9.

Scopus Eid


  • 2-s2.0-84887283725

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2491&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1482

Has Global Citation Frequency


Start Page


  • 163910-1

End Page


  • 163910-9

Volume


  • 114

Issue


  • 16

Place Of Publication


  • United States

Abstract


  • The dependence of the critical current density (Jc) on electric field criteria (Ecr) is studied for high-quality YBCO (YBa 2Cu3O7) thin films over the entire applied magnetic field (Ba) range. The quantitative model describing the J c (B a) dependence is compared and explained for the critical current densities obtained by different measurement techniques. Transport current and quasi-equilibrium magnetization measurement data can successfully be fitted by the model with appropriate electric field criteria. The dependence of the irreversibility field on the Ecr criterion can be obtained within the model. At the same time, the dynamic magnetization measurements of the J c (B a) curves strongly depend on instrumentally defined parameters, introducing inconsistencies in the experimental results. Therefore, the model calculations are able to explain the J c (B a) curves only if the instrumental vibrations affecting vortex behaviour are taken into account. However, the nature of the observed dependence on the vibration of the samples is unclear. Different frequencies of the sample vibrations have been investigated. It is revealed that if the frequency tends to zero, the J c (B a) curves are well described by the model. We have outlined a number of possibilities which may be responsible for the behaviour observed. However, none of the existing theories can explain the effect of the vibrations, which exponentially degrade the irreversibility field to a certain tampered Birr value at frequencies larger than ≃ 25 Hz.

UOW Authors


  •   Golovchanskiy, Igor A. (external author)
  •   Pan, Alexey
  •   Shcherbakova, Olga V. (external author)
  •   Fedoseev, Sergey (external author)

Publication Date


  • 2013

Citation


  • Golovchanskiy, I. A., Pan, A. V., Shcherbakova, O. V. & Fedoseev, S. (2013). Rectifying differences in transport, dynamic, and quasi-equilibrium measurements of critical current density. Journal of Applied Physics, 114 (16), 163910-1-163910-9.

Scopus Eid


  • 2-s2.0-84887283725

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2491&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1482

Has Global Citation Frequency


Start Page


  • 163910-1

End Page


  • 163910-9

Volume


  • 114

Issue


  • 16

Place Of Publication


  • United States