Ultrathin Magnesium-Based Coating as an Efficient Oxygen Barrier for Superconducting Circuit Materials.

Autor: Zhou C; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA., Mun J; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA.; The Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA., Yao J; The Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA.; Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA., Anbalagan AK; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA., Hossain MD; Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA., McLellan RA; Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ, 08540, USA., Li R; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA.; Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA., Kisslinger K; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA., Li G; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA., Tong X; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA., Head AR; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA., Weiland C; Material Measurement Laboratory, National Institute of Standard and Technology, Gaithersburg, MD, 20899, USA., Hulbert SL; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA., Walter AL; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA., Li Q; The Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA.; Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11794, USA., Zhu Y; The Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA., Sushko PV; Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA., Liu M; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 May; Vol. 36 (18), pp. e2310280. Date of Electronic Publication: 2024 Feb 02.
DOI: 10.1002/adma.202310280
Abstrakt: Scaling up superconducting quantum circuits based on transmon qubits necessitates substantial enhancements in qubit coherence time. Over recent years, tantalum (Ta) has emerged as a promising candidate for transmon qubits, surpassing conventional counterparts in terms of coherence time. However, amorphous surface Ta oxide layer may introduce dielectric loss, ultimately placing a limit on the coherence time. In this study, a novel approach for suppressing the formation of tantalum oxide using an ultrathin magnesium (Mg) capping layer is presented. Synchrotron-based X-ray photoelectron spectroscopy studies demonstrate that oxide is confined to an extremely thin region directly beneath the Mg/Ta interface. Additionally, it is demonstrated that the superconducting properties of thin Ta films are improved following the Mg capping, exhibiting sharper and higher-temperature transitions to superconductive and magnetically ordered states. Moreover, an atomic-scale mechanistic understanding of the role of the capping layer in protecting Ta from oxidation is established based on computational modeling. This work provides valuable insights into the formation mechanism and functionality of surface tantalum oxide, as well as a new materials design principle with the potential to reduce dielectric loss in superconducting quantum materials. Ultimately, the findings pave the way for the realization of large-scale, high-performance quantum computing systems.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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