  Recently vortex coalescence was reported in superconducting Sr2RuO4 by
several experimental groups for fields applied along the c-axis. We argue that
Sr2RuO4 is a type-1.5 superconductor with long-range attractive, short-range
repulsive intervortex interaction. The type-1.5 behavior stems from an
interplay of the two orbital degrees of freedom describing this chiral
superconductor together with the multiband nature of the superconductivity.
These multiple degrees of freedom give rise to multiple coherence lengths, some
of which are larger and some smaller than the magnetic field penetration
length, resulting in nonmonotonic intervortex forces.
