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A dc voltage induced by an external ac current is observed in system ofasymmetric mesoscopic superconducting loops. The value and sign of this dcvoltage, like the one of the persistent current, depend in a periodical way ona magnetic field with period corresponded to the flux quantum within the loop.The amplitude of the oscillations does not depend on the frequency of theexternal ac current (in the investigated region 100 Hz - 1 MHz) and depends onits amplitude. The latter dependence is not monotonous. The observed phenomenonof rectification is interpreted as a consequence of a dynamic resistive stateinduced by superposition of the external current and the persistent current. Itis shown that the dc voltage can be added in system of loops connected inseries: the dc voltage oscillations with amplitude up to 0.00001 V wereobserved in single loop, up to 0.00004 V in a system of 3 loops and up to0.0003 V in a system of 20 loops.Comment: 5 pages, 6 figure

Observation of the external-ac-current-induced dc voltage proportional to the steady current in superconducting loops