Thickness dependence of the critical current density in superconducting films: A geometrical approach

Hengstberger, F.; Eisterer, M.; Weber, H. W.
January 2010
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p022508
Academic Journal
We analyze the influence of the magnetic field generated by the supercurrents (self-field) on the current density distribution by numerical simulations. The thickness of the superconducting film determines the self-field and consequently the critical current density at zero applied field. We find an equation, which derives the thickness dependence of the critical current density from its dependence on the magnetic induction. Solutions of the equation reproduce numerical simulations to great accuracy, thus enabling a quantification of the dependence of the self-field critical current density with increasing film thickness. This result is technologically relevant for the development of coated conductors with thicker superconducting layers.


Related Articles

  • Hysteretic ac loss of superconducting strips simultaneously exposed to ac transport current and phase-different ac magnetic field. Mawatari, Yasunori; Kajikawa, Kazuhiro // Applied Physics Letters;1/8/2007, Vol. 90 Issue 2, p022506 

    A simple analytical expression is presented for hysteretic ac loss Q of a superconducting strip simultaneously exposed to an ac transport current I0 cos ωt and a phase-different ac magnetic field H0 cos(ωt+θ0). On the basis of the critical state model, the authors calculate Q for...

  • Nb3Sn Conductor Development for Fusion and Particle Accelerator Applications. Field, M. B.; Parrell, J. A.; Zhang, Y.; Hong, S. // AIP Conference Proceedings;2006, Vol. 824 Issue 1, p544 

    Oxford Instruments, Superconducting Technology (OST) produces high performance Nb3Sn wire via several different “internal tin” routes. OST now routinely produces long lengths of strand made by the Restacked Rod Process that achieve 12 T, 4.2 K non-Cu critical current density (Jc)...

  • Critical Current Densities and Vortex Dynamics in Ba(Fe1− xCo x)2As2 Single Crystals. Tamegai, T.; Taen, T.; Tsuchiya, Y.; Nakajima, Y.; Okayasu, S.; Sasase, M. // Journal of Superconductivity & Novel Magnetism;Jul2010, Vol. 23 Issue 5, p605 

    Superconducting properties are evaluated for high-quality single crystals of Ba(Fe1− xCo x)2As2 in a wide range of doping levels. The critical current density, J c, in an optimally-doped crystal ( T c∼24 K) shows a fishtail effect with its value over 105 A/cm2 even at 5 T below 10 K....

  • Influences of cracking of coated superconducting layer on voltage-current curve, critical current, and n-value in DyBCO-coated conductor pulled in tension. Ochiai, S.; Arai, T.; Toda, A.; Okuda, H.; Sugano, M.; Osamura, K.; Prusseit, W. // Journal of Applied Physics;Oct2010, Vol. 108 Issue 6, p063905 

    Influences of cracking of coating layer under applied tensile strain on V(voltage)-I(current) curve, critical current, and n-value of DyBa2Cu3O7-δ coated conductor were studied experimentally and analytically. The experimentally measured variations in V-I curve, critical current, and n-value...

  • Continuous Deposition of YBCO Films for Coated Conductor Using PLD Method. Yang, J.; Zhang, H.; Feng, X. L.; Liu, H. Z.; Zhou, Q. // Journal of Superconductivity & Novel Magnetism;Aug2010, Vol. 23 Issue 6, p977 

    A reel-to-reel PLD system was set up for studying YBCO coated conductor. YBCO films could be continuously grown on the CeO2/YSZ/Y2O3 buffered Ni-5W tape. Some deposition parameters were investigated. XRD θ–2 θ scans were employed to characterize the c-axis orientation and in-plane...

  • Influence of disorder on the in-field Jc of MgB2 wires using highly active pyrene. Kim, J. H.; Xu, X.; Hossain, M. S. A.; Shi, D. Q.; Zhao, Y.; Wang, X. L.; Dou, S. X.; Choi, S.; Kiyoshi, T. // Applied Physics Letters;1/28/2008, Vol. 92 Issue 4, p042506 

    In this work, we report on significantly enhanced critical current density (Jc) in MgB2 superconductor that was easily obtained by doping with a hydrocarbon, highly active pyrene (C16H10), and using a sintering temperature as low as ∼600 °C. The processing advantages of the C16H10...

  • Universal dependence of the critical current in ceramic high-temperature superconductors. Bogoliubov, N. // Technical Physics;Jan2007, Vol. 52 Issue 1, p65 

    An expression for the critical current in a ceramic sample having a rectangular cross section is derived from experimental data. It is shown that the dependence of the critical current on the cross-sectional area is described by a formula common to all cross sections and the relationship between...

  • Phase diagram of a current-carrying superconducting film in the absence of a magnetic field. Bezuglyi, E. V.; Zolochevskii, I. V. // Low Temperature Physics;Oct2010, Vol. 36 Issue 10, p1008 

    A phase diagram of the current states of superconducting films is produced on the basis of an experimental study of the resistive transitions induced by the transport current. It is found that a comparatively narrow film of width w<5λ⊥ (λ⊥ is the penetration depth of the magnetic...

  • Vortices set and the applied magnetic field for superconductivity in dimension three. Liu, Zuhan // Journal of Mathematical Physics;May2005, Vol. 46 Issue 5, p052111 

    In this paper, the structure of vortices set of the Ginzburg–Landau system of the superconductivity in dimension three was studied when applied magnetic field |hex|=O(|ln [variant_greek_epsilon]|). This singularities set is one-dimensional rectifiable. Its generalized mean curvature was...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics