Quantum magnetoresistive $(hc/2e)/m$-periodic oscillations in a superconducting ring

It has been found experimentally that quantum magnetoresistive $hc/2e$-periodic Little-Parks oscillations in a mesoscopic superconducting ring with a decrease in the temperature and an increase in the applied direct current are modified to the sum of harmonic $(hc/2e)/m$-periodic oscillations. A possible reason for this effect can be multiple Andreev reflection.