High-Temperature-Superconducting Weak Link Defined by the Ferroelectric Field Effect
L. Bégon-Lours, V. Rouco, A. Sander, J. Trastoy, R. Bernard, E. Jacquet, K. Bouzehouane, S. Fusil, V. Garcia, A. Barthélémy, M. Bibes, J. Santamaría, J. E. Villegas
DOI 10.1103/PhysRevApplied.7.064015 · Physical Review Applied
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Abstract
In all-oxide ferroelectric (FE) superconductors (S), due to the low carrier concentration of oxides compared to transition metals, the FE interfacial polarization charges induce an accumulation (or depletion) of charge carriers in the S. This effect leads either to an enhancement or a depression of its critical temperature, depending on the FE polarization direction. Here, we exploit this effect at a local scale to define planar weak links in high-temperature-superconducting wires. These experiments are realized in BiFeO3 (FE)/YBa2Cu3O7−x (S) bilayers in which the remnant FE domain structure is “written” by locally applying voltage pulses with a conductive-tip atomic force microscope. In this fashion, the FE domain pattern defines a spatial modulation of superconductivity. This characteristic allows us to “write” a device whose electrical transport shows different temperature regimes and magnetic-field-matching effects that are characteristic of Josephson coupled weak links. This behavior illustrates the potential of the ferroelectric approach for the realization of high-temperature-superconducting devices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x 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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