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The magnetoresistance oscillations, which occur in a two-dimensional electronsystem exposed to strong microwave radiation when the microwave frequency$\omega$ coincides with the n-th subharmonic of the cyclotron frequency$\omega_c$ have been investigated for n = 2, 3 and 4. It is shown that thesesubharmonic features can be explained within a non-equilibrium energydistribution function picture without invoking multi-photon absorptionprocesses. The existence of a frequency threshold above which such oscillationsdisappear lends further support to this explanation.Comment: 5 pages, 5 figure

Microwave induced magnetoresistance oscillations at the subharmonics of the cyclotron resonance