Superconductivity from a melted insulator in Josephson junction arrays.
Quantum simulation
Superconducting properties and materials
Journal
Nature physics
ISSN: 1745-2473
Titre abrégé: Nat Phys
Pays: England
ID NLM: 101235387
Informations de publication
Date de publication:
2023
2023
Historique:
received:
18
09
2022
accepted:
03
07
2023
medline:
16
11
2023
pubmed:
16
11
2023
entrez:
16
11
2023
Statut:
ppublish
Résumé
Arrays of Josephson junctions are governed by a competition between superconductivity and repulsive Coulomb interactions, and are expected to exhibit diverging low-temperature resistance when interactions exceed a critical level. Here we report a study of the transport and microwave response of Josephson arrays with interactions exceeding this level. Contrary to expectations, we observe that the array resistance drops dramatically as the temperature is decreased-reminiscent of superconducting behaviour-and then saturates at low temperature. Applying a magnetic field, we eventually observe a transition to a highly resistive regime. These observations can be understood within a theoretical picture that accounts for the effect of thermal fluctuations on the insulating phase. On the basis of the agreement between experiment and theory, we suggest that apparent superconductivity in our Josephson arrays arises from melting the zero-temperature insulator.
Identifiants
pubmed: 37970534
doi: 10.1038/s41567-023-02161-w
pii: 2161
pmc: PMC10635826
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1630-1635Informations de copyright
© The Author(s) 2023.
Déclaration de conflit d'intérêts
Competing interestsThe authors declare no competing interests.
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