Josephson dynamics of bicrystal d-wave YBa2Cu3O7−δ dc-SQUIDs
T. Lindström, J. Johansson, T. Bauch, E. Stepantsov, F. Lombardi, S. A. Charlebois
DOI 10.1103/PhysRevB.74.014503 · Physical Review B
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Abstract
The properties of YBa2Cu3O7−δ dc-SQUIDs (superconducting quantum interference devices) with 0°–45° grain boundary junctions have been studied. Structures fabricated on two types of bicrystals have been investigated: The conventional [001]-tilt type and a novel configuration with both [001] and [100] tilt. Measurements have been performed in the temperature range 50mK–30K. We find that the complicated dynamics of these SQUIDs can be understood if the effects of the predominant d-wave symmetry on the current transport is taken into account. In particular the presence of a second-harmonic current component in the current phase relation and the inclusion of π-facets in the grain boundary are shown to be important effects. We also find that by increasing the [100] tilt of the grain boundary it is possible to increase the quality factor of the SQUIDs without reducing the magnitude of the second-harmonic current component. A simple model, which includes the effects of faceting of the grain boundary and the presence of a second-harmonic current component, is shown to be in qualitative agreement with our results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ 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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