caa a22 4500 445381108 CHVBK 20180317143017.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0953-z doi (NATIONALLICENCE)springer-10.1007/s10948-010-0953-z Effect of Li-Substitution on the Resistivity and Magnetoresistance of LaMnO y [Elektronische Daten] [A. Ahmed, A. Diab, H. Mohamed] The temperature dependence of the resistivity (ρ) and magneto-resistance (MR) effect of La1−x LixMnOy (x=0.05, 0.1, 0.15, 0.2 & 0.25 at.%) fixed valence doped compounds were studied between 80 and 320K. X-ray powder diffraction (XRD) at room temperature shows that the samples are single phase. The resistivity of all samples with and without magnetic field shows a metal-semiconductor (M-S) transition for all compositions. In addition, the replacement of the Li-substitution results in a reduction of the transition temperature T ms and increasesρ. In the magnetic field of0.5 Tesla a large negative magnetoresistance (MR=50%) was observed, which is encouraging for potential application of colossal magnetoresistance (CMR) material at low fields. We determine the activation energy (E ρ) in the semiconductor region. Springer Science+Business Media, LLC, 2010 The resistivity nationallicence Colossal magnetoresistance nationallicence Curie temperature nationallicence Ahmed A. Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt aut Diab A. Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt aut Mohamed H. Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 597-601 1557-1939 24:1-2<597 2011 24 10948 https://doi.org/10.1007/s10948-010-0953-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0953-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ahmed A. Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt aut NATIONALLICENCE 700 1- Diab A. Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt aut NATIONALLICENCE 700 1- Mohamed H. Physics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 597-601 1557-1939 24:1-2<597 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer