Electron paramagnetic resonance spectra of PbMnI2 bulk crystals and nanocrystals

• The EPR spectra for bulk crystals and nanocrystals of Pb1−xMnxI2 consist of sixplet lines which correspond to hyperfine spectra of Mn2+ ions.
• For nanocrystals with manganese content up to x=0.08 we observed a superposition of two component spectra.
• For the first of the broad line in EPR spectrum for nanocrystals the following values gǁ=2.05 and g⊥=2.15 are determined.
• The temperature dependence of the integral intensity for samples with Mn content x≤0.03 is in good agreement with the Curie-Weiss law.

We report a study of the Pb1−xMnxI2 bulk crystals and nanocrystals using electron paramagnetic resonance (EPR). The samples of the bulk Pb1−xMnxI2 crystals with x in the range from 0 to 0.05 have been grown by Bridgman technique. The composite nanostructures containing the diluted magnetic semiconductor nanocrystals of Pb1−xMnxI2 with x in the range from 0 to 0.15 have been prepared by embedding them into gelatin and polyvinylalcohol matrices using colloidal technology. The EPR spectra consist of an intense broad line and several weak narrow lines which correspond to hyperfine spectra of Mn2+ ions. The temperature dependence of EPR spectra suggests of strong spin exchange interactions due to presence of magnetic ions in the bulk crystals and nanoparticles. The good agreement temperature dependence of integral intensity of Mn2+ ions for bulk crystals and nanocrystals with the Curie–Weiss law was obtained.