Vortex properties of YBa2Cu3O7 superconducting thin films: Irreversible magnetization and the effect of thickness
Chang Jun Liu, Claire Schlenker, Jürgen Schubert, Bernd Stritzker
DOI 10.1103/PhysRevB.48.13911 · Physical Review B
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Abstract
Magnetic properties of epitaxial thin films of YBa2Cu3O7 have been studied in the superconducting state in fields perpendicular to the sample, along the c crystallographic axis. In the low-temperature state, susceptibility, hysteresis loop, and remanent magnetization (trapped flux) studies show that a critical state is established in very low applied fields. The flux penetration process and the related thickness properties are well accounted for by simple electromagnetic models for the critical current. It is shown that the evaluation of the critical current Jc by the classical Bean formula is roughly valid, in spite of the curvature of the vortices. A decrease in the low-temperature value of Jc with increasing thickness is found above 100 nm. In the temperature range close to Tc, the irreversibility line moves towards higher field with increasing thickness according to a d1/2 law. This is discussed in relation with the theories of vortex-lattice and vortex-glass melting.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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