NMR study of LaMn1-xCoxO3LaMn1-xCoxO3 perovskites

The perovskite compounds of LaMn1-xCoxO3(0.2⩽x⩽0.5) have been studied by means of NMR spectroscopy in powder samples prepared by the solid state reaction and sol–gel methods. The NMR signals were observed in the frequency range 250–650 MHz at 4.2 K in zero external magnetic field. A relatively narrow spectral line assigned to 55Mn in Mn4+Mn4+ is situated around 270–320 MHz in all spectra. Additional spectral lines are observed at higher frequencies. Line intensities and forms are dependent on the cobalt concentration and preparation techniques.