  We report an Aharonov-Bohm superperiod of five magnetic flux quanta (5h/e)
observed in a Laughlin quasiparticle interferometer, where an edge channel of
the 1/3 fractional quantum Hall fluid encircles an island of the 2/5 fluid.
This result does not violate the auge invariance argument of the Byers-Yang
theorem because the magnetic flux, in addition to affecting the Aharonov-Bohm
phase of the encircling 1/3 quasiparticles, creates the 2/5 quasiparticles in
the island. The superperiod is accordingly understood as imposed by the anyonic
statistical interaction of Laughlin quasiparticles.
