Encapsulating High-Temperature Superconducting Twisted van der Waals Heterostructures Blocks Detrimental Effects of Disorder

Lee Y, Martini M, Confalone T, Shokri S, Saggau CN, Wolf D, Gu G, Watanabe K, Taniguchi T, Montemurro D, Vinokur VM, Nielsch K, Poccia N (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Advanced Materials Wiley

DOI: 10.1002/adma.202209135

Abstract

High-temperature cuprate superconductors based van der Waals (vdW) heterostructures hold high technological promise. One of the obstacles hindering their progress is the detrimental effect of disorder on the properties of the vdW-devices-based Josephson junctions (JJs). Here, a new method of fabricating twisted vdW heterostructures made of Bi2Sr2CuCa2O8+δ, crucially improving the JJ characteristics and pushing them up to those of the intrinsic JJs in bulk samples, is reported. The method combines cryogenic stacking using a solvent-free stencil mask technique and covering the interface by insulating hexagonal boron nitride crystals. Despite the high-vacuum condition down to 10−6 mbar in the evaporation chamber, the interface appears to be protected from water molecules during the in situ metal deposition only when fully encapsulated. Comparing the current–voltage curves of encapsulated and unencapsulated interfaces, it is revealed that the encapsulated interfaces’ characteristics are crucially improved, so that the corresponding JJs demonstrate high critical currents and sharpness of the superconducting transition comparable to those of the intrinsic JJs. Finally, it is shown that the encapsulated heterostructures are more stable over time.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Brookhaven National Laboratory US United States (USA) (US) National Institute of Materials Science (NIMS) JP Japan (JP) Università degli Studi di Napoli Federico II IT Italy (IT) Terra Quantum AG CH Switzerland (CH) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Lee, Y., Martini, M., Confalone, T., Shokri, S., Saggau, C.N., Wolf, D.,... Poccia, N. (2023). Encapsulating High-Temperature Superconducting Twisted van der Waals Heterostructures Blocks Detrimental Effects of Disorder. Advanced Materials. https://dx.doi.org/10.1002/adma.202209135

MLA:

Lee, Yejin, et al. "Encapsulating High-Temperature Superconducting Twisted van der Waals Heterostructures Blocks Detrimental Effects of Disorder." Advanced Materials (2023).

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