  In the recent experiments the unusual oscillatory magnetoresistance in
superconductors was discovered with a periodicity essentially independent on
magnetic field direction and even material parameters. The nearly universal
period points to a subatomic mechanism of the phenomenon. This mechanism is
related to formation inside samples of subatomically thin ($10^{-11}cm$)
threads in the form of rings of the interatomic radius. Electron states of
rings go over into conduction electrons which carry the same spin imbalance in
energy as rings. The imbalance occurs due to spin interaction with the orbital
momentum of the ring. The conductivity near $T_c$ is determined by fluctuating
Cooper pairs consisting of electrons with shifted energies. Due to different
angular momenta of rings these energies periodically depend on magnetic field
resulting in the observed oscillatory magnetoresistance. Calculated universal
positions of peaks $(n+1/2)\Delta H$ ($\Delta H\simeq 0.18T$ and $n=0,1,2...$)
on the $R(H)$ curve are in a good agreement with experiments.
