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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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Call Number BT @ pedrazp @ Serial 858
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