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| Author | Navarro, H.; Sirena, M.; Kim, J.; Haberkorn, N. | ||||
| Title | Josephson coupling in high-Tc superconducting junctions using ultra-thin BaTiO3 barriers | Type | Journal Article | ||
| Year | 2020 | Publication | Materials Science and Engineering: B | Abbreviated Journal | Mater. Sci. Eng. B |
| Volume | 262 | Issue | Pages | 114714 | |
| Keywords | Josephson junctionsHigh-Tc superconductorsThin films | ||||
| Abstract | We study the electrical transport of vertically-stacked Josephson tunnel junctions using GdBa2Cu3O7−δ electrodes and a BaTiO3 barrier with thicknesses between 1 nm and 3 nm. Current-voltage measurements at low temperatures show a Josephson coupling for junctions with BaTiO3 barriers of 1 nm and 2 nm. Reducing the barrier thickness bellow a critical thickness seems to suppress the ferroelectric nature of the BaTiO3. The Josephson coupling temperature reduces as the barrier thicknesses increases. The Josephson energies at 12 K are of ≈ 1.5 mV and ≈ 7.5 mV for BaTiO3 barriers of 1 nm and 2 nm, respectively. Fraunhofer patterns are consistent with fluctuations in the critical current due to structural inhomogeneities in the barriers. Our results are promising for the development of Josephson junctions using high-Tc electrodes with energy gaps much higher than those usually present in conventional low-temperature superconductors. | ||||
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| ISSN | 0921-5107 | ISBN | Medium  |
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| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 858 | ||
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