Electron magnetic resonance (EMR) was employed to study magnetic properties of self-doped LaMn1-xO3 (x=0, 0.02 and 0.06) manganites in interval 120-600 K. Resonance spectra evidence that x=0 and 0.02 samples show antiferromagnetic (AFM) ground state at low temperatures, while x=0.06 one demonstrates ferromagnetic (FM)-like ground state. Spectra of the parent compound reveal some FM entities within the AFM matrix. Self-doping leads to a sharp increase of low-temperature double-integrated intensity of resonance signals pointing out progressive growth of ferromagnetic component. Paramagnetic (PM) state g-factor gradually changes from 1.91±0.01 to 1.98 with increasing x from 0 to 0.06. The results obtained show that vacancies at Mn-sites induce FM state through creation of Mn4+ ions in Mn3+ host and reinforcement of double-exchange (DE) interaction.
- Ferromagnetic and electron paramagnetic resonance
- Self-doped CMR manganite
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics