Direct Observation of the Current-Phase Relation of an Adjustable Superconducting Point Contact
M. C. Koops, G. V. van Duyneveldt, R. de Bruyn Ouboter
DOI 10.1103/PhysRevLett.77.2542 · Physical Review Letters
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Abstract
By placing a mechanically controllable breakjunction in a superconducting loop the current-phase relation is measured over the complete phase range for atomic-size quantum point contacts with direct conductivity. The current-phase relations show at low temperatures a clear nonsinusoidal behavior with an extremum at phase differences between π/2 and π. When the self-inductance of the loop is reduced the measured current-phase relations approach the predictions of the theory for (quantum) point contacts in the ballistic limit.
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. | 9.2 | Pressure not reported | unknown |
| Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
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