Abstract

Magnetic and electronic transport properties of the electron-doped manganites La 0.9− x A x Te 0.1MnO 3 (A = Y or Ho, 0.05 ⩽ 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 T C and T C shifts to lower temperature with increasing Y/Ho doping level. It is very interesting to find that the values of T C 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.

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