Supercurrent-phase relationship of a Nb∕InAs(2DES)∕Nb Josephson junction in overlapping geometry
Mark Ebel, Christian Busch, Ulrich Merkt, Miroslav Grajcar, Tomáš Plecenik, Evgeni Il’ichev
DOI 10.1103/PhysRevB.71.052506 · Physical Review B
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Abstract
Superconductor∕normal conductor∕superconductor Josephson junctions with highly transparent interfaces are predicted to show significant deviations from sinusoidal supercurrent-phase relationships (CPR) at low temperatures. We investigate experimentally the CPR of a ballistic Nb∕InAs(2DES)∕Nb junction in the temperature range from 1.3Kto9K using a modified Rifkin-Deaver method. The CPR is obtained from the inductance of the phase-biased junction. Transport measurements complement the investigation. At low temperatures, substantial deviations of the CPR from conventional tunnel-junction behavior have been observed. The data are fitted with a model presented by Grajcar et al. [Physica C 372–376, 27 (2002)], yielding good agreement.
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. | 6.5 | Pressure not reported | unknown |
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