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Isothermal magnetization curves of a superconducting Nb film perforated by a square lattice of Ni dots exhibit quasiperiodic instabilities below ϳ4 K, with a field-dependent period equal to the first, second, or third matching fields. The instabilities are found in a range of applied fields well above the saturation matching value, and under conditions where a continuous Nb film with the same dimensions and magnetization remained stable. The results suggest that terraces of matched flux density exist at the border of a flux-depleted zone created by a geometric barrier near the film edge. Geometric effects may thus play an important role in determining the presence or absence of matching effects. RAPID COMMUNICATIONS R9250PRB 61 A. TERENTIEV et al. RAPID COMMUNICATIONS PRB 61 R9251 PERIODIC MAGNETIZATION INSTABILITIES IN A . . . RAPID COMMUNICATIONS R9252PRB 61 A. TERENTIEV et al.

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