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Magnetotransport properties of Sm0.864Pb0.136MnO3 single crystal

V. LOVCHINOV1,* , A. APOSTOLOV1, D. DIMITROV1, P. SIMEONOVA1, K. NENKOV2

Affiliation

  1. George Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria
  2. Leibniz-Institut fur Festkoerper und Werkstoffforschung, 01171 Dresden, Germany

Abstract

Magnetic and electrical properties of Sm0.864Pb0.136MnO3 single crystals have been studied. The sample is paramagnetic in the temperature range 150 - 300 K and has paramagnetic moment 5.3 ± 0.3 μB at room temperature. At 65 K antiferromagnetic ordering occurs as a second-order phase transition accompanied by a weak ferromagnetic moment along the Z direction (fz = 0,4 μB). At 8 K an additional low temperature antiferromagnetic transition occurs as a first order phase transition with spontaneous magnetization along the X direction (fx = 0,7 μB). A weak M(H) curves hysteresis was observed only for the temperatures at which the ferromagnetic moments become reoriented from the Z direction (II order phase transition) to the X direction (I order phase transition). Resistivity measurements were fulfilled at zero and 5 T magnetic fields. They show that the Sm0.864Pb0.136MnO3 single crystal is insulator in the temperature range 2 - 300 K and possesses a positive magnetoresistance (MR) only in the temperature range 129 - 142 K. The maximum value of MR reaches 154% around 141 K..

Keywords

Magnetoelectric effect, Ferroelectric effect, Manganese oxides.

Submitted at: May 8, 2007
Accepted at: Sept. 18, 2007

Citation

V. LOVCHINOV, A. APOSTOLOV, D. DIMITROV, P. SIMEONOVA, K. NENKOV, Magnetotransport properties of Sm0.864Pb0.136MnO3 single crystal, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2897-2901 (2007)