Electric and magnetic properties of Cu-doped La–Sr manganites

Abstract Samples of La 0.89 Sr 0.11 Mn 1− y Cu y O 3+ δ ( y =0.00, 0.07) were prepared and characterized by magnetic and transport measurements and zero-field nuclear magnetic resonance. All samples displayed ferromagnetic metallic behavior below the ordering temperature, which decreased for the Cu-doped sample. 139 La NMR spectra have been observed around 19 MHz for both samples, with remarkable broadening and splitting introduced by the Cu doping. An estimate of the magnetoresistivity and magnetocaloric properties was provided as well.