Low-temperature characterization of Nb-Cu-Nb weak links with Ar ion-cleaned interfaces

Robab Najafi Jabdaraghi, Joonas Peltonen, Olli-Pentti Saira, Jukka Pekola

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

17 Sitaatiot (Scopus)
432 Lataukset (Pure)

Abstrakti

We characterize niobium-based lateral Superconductor (S)-Normal metal (N)-Superconductor (SNS) weak links through low-temperature switching current measurements and tunnel spectroscopy. We fabricate the SNS devices in two separate lithography and deposition steps, combined with strong argon ion cleaning before the normal metal deposition in the last step. Our SNS weak link consists of high-quality sputtered Nb electrodes that have contacted with evaporated Cu. The two-step fabrication flow enables more flexibility in the choice of materials and pattern design. A comparison of the temperature-dependent equilibrium critical supercurrent with theoretical predictions indicates that the quality of the Nb-Cu interface is similar to that of evaporated Al-Cu weak links. We further demonstrate a hybrid magnetic flux sensor based on an Nb-Cu-Nb SNS junction, where the phase-dependent normal metal density of states is probed with an Al tunnel junction.

AlkuperäiskieliEnglanti
Artikkeli042604
Sivut1-5
JulkaisuApplied Physics Letters
Vuosikerta108
Numero4
DOI - pysyväislinkit
TilaJulkaistu - 25 tammik. 2016
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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