We have studied fundamental properties of weak-link Sr2RuO4/Sr2RuO4 Josephson junctions fabricated by making a narrow constriction on superconducting Sr2RuO4 films through laser micro-patterning. The junctions show a typical overdamped behavior with much higher critical current density, compared with those previously reported for bulk Sr2RuO4/s-wave superconductor junctions. Observed magnetic field and temperature dependences of the Josephson critical current suggest that the chiral p-wave is unlikely for the superconducting symmetry, encouraging further theoretical calculations of the Sr2RuO4/Sr2RuO4 type junctions.
@article{arxiv.2001.01844,
title = {Characterization of Sr2RuO4 Josephson junctions made of epitaxial films},
author = {Masaki Uchida and Ikkei Sakuraba and Minoru Kawamura and Motoharu Ide and Kei S. Takahashi and Yoshinori Tokura and Masashi Kawasaki},
journal= {arXiv preprint arXiv:2001.01844},
year = {2020}
}