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VOLUME 21 | ISSUE 9 | PAGE 547
Instability of polarization in a system of electron and nuclear spins of an n-type semiconductor under optical orientation in weak magnetic fields
We observed instability in a system of optically oriented electron and nuclear spins of an η-type semiconductor; this instability leads to the onset of oscillations of the degree of polarization ρ of the luminescence, with a period that amounts to dozens of seconds. With weak influence of the nuclei, the electron depolarization takes place in fields Ж 10 Oe. At a strong influence of the nuclei, a line of width —0.1 Oe is observed in the р(Я) spectrum.