Encapsulating High‐Temperature Superconducting Twisted van der Waals Heterostructures Blocks Detrimental Effects of Disorder
Superconductivity (cond-mat.supr-con)
Condensed Matter - Strongly Correlated Electrons
Condensed Matter - Mesoscale and Nanoscale Physics
Strongly Correlated Electrons (cond-mat.str-el)
Condensed Matter - Superconductivity
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
FOS: Physical sciences
01 natural sciences
0104 chemical sciences
DOI:
10.1002/adma.202209135
Publication Date:
2023-01-25T03:18:31Z
AUTHORS (13)
ABSTRACT
High-temperature cuprate superconductors-based van der Waals (vdW) heterostructures hold high technological promise. One of the obstacles hindering progress is the detrimental effect of disorder on the properties of Josephson junctions (JJ) realized by the vdW devices. Here we report the new method of fabricating twisted vdW heterostructures made of Bi2Sr2CuCa2O8+d, crucially improving the JJ characteristics, pushing them up to those of the intrinsic JJs in bulk samples. The method combines a cryogenic stacking using a solvent-free stencil mask technique and covering interface by the 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, we reveal 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, we show that the encapsulated heterostructures are more stable in time.
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