Magnetic and electronic transport properties of Y- and Ho-doped La0.9Te0.1MnO3

Magnetic and electronic transport properties of the electron-doped manganites La0.9−xAxTe0.1MnO3 (A = Y or Ho, 0.05⩽x⩽0.150.05⩽x⩽0.15) have been investigated by measurements of magnetization, resistivity and magnetoresistance. All samples undergo a paramagnetic (PM)–ferromagnetic (FM) phase transition at Curie temperature TCTC and TCTC shifts to lower temperature with increasing Y/Ho doping level. It is very interesting to find that the values of TCTC and M of the Ho composition are smaller than those of the Y composition for the same concentration, although Y and Ho ions have almost the same ionic radii. Electronic transport measurements indicate that the Ho-doped compound have higher resistivity than the Y-doped one for the same doping level. These observed results are discussed according to the antiferromagnetic (AFM) coupling of the Ho magnetic moment to that of Mn.