Direct demonstration of circulating currents in a controllable π-SQUID generated by a 0 to π transition of the weak links
J. J. A. Baselmans, B. J. van Wees, T. M. Klapwijk
DOI 10.1103/PhysRevB.65.224513 · Physical Review B
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Abstract
A controllable π-SQUID is a DC SQUID (direct-current superconducting quantum interference device) with two controllable π junctions as weak links. A controllable π junction consists of a superconducting–normal metal–superconducting Josephson junction with two additional contacts to the normal region of the junction. By applying a voltage Vc over these contacts it is possible to control the state of the junction, i.e., a conventional (0) state or a π state, depending on the magnitude of Vc. We demonstrate experimentally that, by putting one junction into a π state, a screening current is generated around the SQUID loop at an integer external flux. To be able to do this, we have fabricated controllable π junctions, based on Cu-Nb or Ag-Nb, in a new geometry. We show that at 1.4 K only the Ag-Nb device shows the transition to a π state as a function of Vc consistent with theoretical predictions. In a controllable π-SQUID based on Nb-Ag we observe, apart from a screening current at integer external flux, a phase shift of π of the VSQUID−B oscillations under a suitable current bias, depending on the magnitude of Vc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cu-Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ag-Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | unknown |
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