Low-leakage superconducting tunnel junctions with a single-crystal Al 2O3 barrier

S. Oh; K. Cicak; R. McDermott; K. B. Cooper; K. D. Osborn; R. W. Simmonds; M. Steffen; J. M. Martinis; D. P. Pappas

doi:10.1088/0953-2048/18/10/026

Low-leakage superconducting tunnel junctions with a single-crystal Al ₂O₃ barrier

S. Oh, K. Cicak, R. McDermott, K. B. Cooper, K. D. Osborn, R. W. Simmonds, M. Steffen, J. M. Martinis, D. P. Pappas

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26 Scopus citations

Abstract

We have developed a two-step growth scheme for single-crystal Al ₂O₃ tunnel barriers. The barriers are epitaxially grown on single-crystal rhenium (Re) base electrodes that are grown epitaxially on a sapphire substrate, while polycrystalline Al is used as the top electrode. We show that by first growing an amorphous aluminium (Al) oxide layer at room temperature and crystallizing it at a high temperature in oxygen environment, a morphologically intact single-crystal Al₂O₃ layer is obtained. Tunnel junctions fabricated from these trilayers show very low subgap leakage current. This single-crystal Al₂O₃ junction may open a new venue for coherent quantum devices.

Original language	English (US)
Pages (from-to)	1396-1399
Number of pages	4
Journal	Superconductor Science and Technology
Volume	18
Issue number	10
DOIs	https://doi.org/10.1088/0953-2048/18/10/026
State	Published - Oct 1 2005
Externally published	Yes

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All Science Journal Classification (ASJC) codes

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Cite this

Oh, S., Cicak, K., McDermott, R., Cooper, K. B., Osborn, K. D., Simmonds, R. W., Steffen, M., Martinis, J. M., & Pappas, D. P. (2005). Low-leakage superconducting tunnel junctions with a single-crystal Al ₂O₃ barrier. Superconductor Science and Technology, 18(10), 1396-1399. https://doi.org/10.1088/0953-2048/18/10/026

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AU - Cicak, K.

AU - McDermott, R.

AU - Cooper, K. B.

AU - Osborn, K. D.

AU - Simmonds, R. W.

AU - Steffen, M.

AU - Martinis, J. M.

AU - Pappas, D. P.

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10.1088/0953-2048/18/10/026