Quantum Oscillations of the Critical Current of Asymmetric Aluminum   Loops in Magnetic Field
  The periodical dependencies in magnetic field of the asymmetry of the current-voltage curves of asymmetric aluminum loop are investigated experimentally at different temperatures below the transition into the superconducting state T < Tc. The obtained periodical dependencies of the critical current on magnetic field allow to explain the quantum oscillations of the dc voltage as consequence of the rectification of the external ac current and to calculate the persistent current at different values of magnetic flux inside the loop and temperatures. 
V.L. Gurtovoi, S.V Dubonos, A.V. Nikulov, N.N. Osipov, and V.A. Tulin