Physics – Condensed Matter – Superconductivity
Scientific paper
2010-05-14
Physics
Condensed Matter
Superconductivity
Scientific paper
The current-phase relation (CPR) of a Josephson junction reveals valuable information about the microscopic processes and symmetries that influence the supercurrent. In this Letter, we present direct measurements of the CPR for Josephson junctions with a graphene barrier, obtained by a phase-sensitive SQUID interferometry technique. We find that the CPR is skewed with respect to the commonly observed sinusoidal behavior. The amount of skewness varies linearly with critical current (Ic) regardless of whether Ic is tuned by the carrier density or temperature.
Chialvo Cesar
Mason Nadya
Moraru Ion C.
Van Harlingen Dale J.
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