  We argue that a locally time-reversal symmetry breaking state can occur at
Josephson junctions between unconventional superconductors. Order parameters
induced by the proximity effect can combine with the bulk order parameter to
form such a state. This property is specifically due to the intrinsic phase
structure of the pairing wave function in unconventional superconductors.
Experimental consequences of this effect in high-temperature superconductors
are examined.
