1.
J Phys Condens Matter
; 22(49): 495601, 2010 Dec 15.
Artigo
em Inglês
| MEDLINE
| ID: mdl-21406786
RESUMO
Muon spin rotation/relaxation spectroscopy has been employed to study electron localization into a bound magnetic polaron around the positive muon in the 3d magnetic spinel semiconductor CdCr2Se4 at temperatures up to 300 K (far above the ferromagnetic transition at Tc = 130 K) in magnetic fields up to 7 T. Electron localization into a magnetic polaron occurs due to its strong exchange interaction with the magnetic 3d electrons of local Cr(3 +) ions, which confines its wavefunction to within R≈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 magnetic properties of magnetic semiconductors.