Superconductor/normal conductor/superconductor (SNS) 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 1.3 K to 9 K 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. A theoretical model yielding good agreement to the data is presented.
@article{arxiv.cond-mat/0407206,
title = {Supercurrent-phase relationship of a Nb/InAs(2DES)/Nb Josephson junction in overlapping geometry},
author = {M. Ebel and C. Busch and U. Merkt and M. Grajcar and T. Plecenik and E. Il'ichev},
journal= {arXiv preprint arXiv:cond-mat/0407206},
year = {2009}
}