Anisotropic nonmonotonic behavior of the superconducting critical current in thin YBa2Cu3O7−δ films on vicinal SrTiO3 surfaces
C. Cantoni, D. T. Verebelyi, E. D. Specht, J. Budai, D. K. Christen
DOI 10.1103/PhysRevB.71.054509 · Physical Review B
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Abstract
The critical current density of epitaxial YBa2Cu3O7−δ (YBCO) films grown on vicinal SrTiO3 substrates was investigated by electrical transport measurements along and across the steps of the SrTiO3 surface for a range of temperatures of 10to85K and in applied magnetic fields varying from 0to14T. For vicinal angles of 4° and 8°, we found evidence of enhanced pinning in the longitudinal direction at low magnetic fields for a wide region of temperatures and attribute this phenomenon to antiphase boundaries in the YBCO film. The transverse Jc data showed a peak in the Jc(H) curve at low magnetic fields, which was explained on the basis of magnetic interaction between Abrikosov and Abrikosov-Josephson vortices. The in-plane Jc anisotropy observed for vicinal angles of 0.4° was reversed with respect to the 8° and 4° samples. This phenomenon was interpreted on the basis of strain induced in the YBCO film by the stepped substrate’s surface.
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. | 93.3 | Pressure not reported | onset |
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