Central Peak Position in Magnetization Loops of High- Tc Superconductors
D. V. Shantsev, M. R. Koblischka, Y. M. Galperin, T. H. Johansen, L. Půst, M. Jirsa
DOI 10.1103/PhysRevLett.82.2947 · Physical Review Letters
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Abstract
Exact analytical results are obtained for the magnetization of a superconducting thin strip with a general behavior Jc(B) of the critical current density. We show that within the critical-state model the magnetization as a function of applied field, Ba, has an extremum located exactly at Ba=0. This result is in excellent agreement with presented experimental data for a YBa2Cu3O7−δ thin film. After introducing granularity by patterning the film, the central peak becomes shifted to positive fields, Bcp>0, on the descending field branch of the loop. Our results show that a positive Bcp is a definite signature of granularity in superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure unresolved | onset |
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