Numerical extension of the power law Jc(B) to zero field in thin superconducting films

✍ Scribed by F. Hengstberger; M. Eisterer; H.W. Weber

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 184 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2010.01.048

✦ Synopsis

Numerical simulations of the current and field distribution in thin superconducting films are carried out for a given material law J c (B) and as a function of the applied field H, taking the sample's self-field into account. The dependence of the critical current density on the applied field J c (H) is computed for comparison with experiment, considering the geometry of transport measurements.

We show that extrapolating the high-field power law J c / B Àa to the lowest fields results in a finite critical current at zero applied field J c ðH ¼ 0Þ, despite the singularity of J c (B). Moreover, particular features of the experiment, such as a low field plateau in J c (H), are reproduced and found to be determined by the self-field.