Abstract
Muon spin rotation/relaxation spectroscopy has been employed to study electron localization intoa bound magnetic polaron around the positive muon in the 3d magnetic spinel semiconductorCdCr2Se4 at temperatures up to 300 K (far above the ferromagnetic transition atTc = 130 K) in magnetic fields up to 7 T. Electron localization into a magnetic polaron occursdue to its strong exchange interaction with the magnetic 3d electrons of localCr3 + ions, which confines its wavefunction to withinR≈0.3 nm, allowing significant overlap with both the nearest and the next nearest shells of Cr ions.Formation of such magnetic polarons may explain peculiar electronic and magneticproperties of magnetic semiconductors.
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