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We have experimentally examined the state of a two-dimensional electron gas subjected to unidirectional periodic potential modulation in the vicinity of the filling ν=5/3 (equivalent to ν=1/3 by the particle-hole symmetry). In addition to a peak in the longitudinal resistivity ρxx, we find small amplitude oscillations roughly periodic in the magnetic field B in the Hall resistivity ρyx. The oscillations appear in a narrow range of the electron density ne, and the period ΔB of the oscillations increases with the slight increase in ne. The oscillations are interpreted as resulting from the commensurability between the high harmonics of the modulation potential and the stripe state, which is predicted by the density matrix renormalization group calculations to be the ground state in our system.

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