Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions
Justus Teller, Christian Schäfer, Kristof Moors, Benjamin Bennemann, Matvey Lyatti, Florian Lentz, Detlev Grützmacher, Roman-Pascal Riwar, Thomas Schäpers
DOI 10.1103/gxdc-py56 · Physical Review Letters
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Abstract
We study the frustration pattern of a square lattice with in situ fabricated Nb-Pt-Nb four-terminal Josephson junctions. The four-terminal geometry gives rise to a checkerboard pattern of alternating fluxes f, f′ piercing the plaquettes, which stabilizes the Berezinskii-Kosterlitz-Thouless transition even at irrational flux quanta per plaquette, due to an unequal repartition of integer flux sum f+f′ into alternating plaquettes. This type of frustrated frustration manifests as a beating pattern of the dc resistance, with state configurations at the resistance dips gradually changing between the conventional zero- and half-flux states. Hence, the four-terminal Josephson junction array offers a promising platform to study previously unexplored flux and vortex configurations and provides an estimate on the spatial expansion of the four-terminal Josephson junction central weak link area.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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