  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.
