Abstract:
:Vortices in quantum condensates exist owing to a macroscopic phase coherence. Here we show, both experimentally and theoretically, that a quantum vortex with a well-defined core can exist in a rather thick normal metal, proximized with a superconductor. Using scanning tunneling spectroscopy we reveal a proximity vortex lattice at the surface of 50 nm-thick Cu-layer deposited on Nb. We demonstrate that these vortices have regular round cores in the centers of which the proximity minigap vanishes. The cores are found to be significantly larger than the Abrikosov vortex cores in Nb, which is related to the effective coherence length in the proximity region. We develop a theoretical approach that provides a fully self-consistent picture of the evolution of the vortex with the distance from Cu/Nb interface, the interface impedance, applied magnetic field, and temperature. Our work opens a way for the accurate tuning of the superconducting properties of quantum hybrids.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Stolyarov VS,Cren T,Brun C,Golovchanskiy IA,Skryabina OV,Kasatonov DI,Khapaev MM,Kupriyanov MY,Golubov AA,Roditchev Ddoi
10.1038/s41467-018-04582-1subject
Has Abstractpub_date
2018-06-11 00:00:00pages
2277issue
1issn
2041-1723pii
10.1038/s41467-018-04582-1journal_volume
9pub_type
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