Effect of Ga doping on magneto-transport properties in colossal magnetoresistive La0.7Ca0.3Mn1−xGaxO3 (0<x<0.1) |
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| Authors: | Marek P?ka?a Jan Mucha Benedicte Vertruyen Rudi Cloots Marcel Ausloos |
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| Affiliation: | 1. Department of Chemistry, University of Warsaw, Al. Zwirki i Wigury 101, PL-02-089 Warsaw, Poland;2. Institute of Low Temperature and Structural Research, Polish Academy of Sciences, PL-50-950 Wroclaw, Poland;3. SUPRATECS, University of Liege, Institute of Chemistry B6, Sart Tilman, B-4000 LIEGE Belgium;4. SUPRATECS, University of Liege, Institute of Physics B5, Sart Tilman, B-4000 LIEGE Belgium |
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| Abstract: | Samples of La0.7Ca0.3Mn1−xGaxO3 with x=0, 0.025, 0.05 and 0.10 were prepared by standard solid-state reaction. They were first characterized chemically, including the microstructure. The magnetic properties and various transport properties, i.e. the electrical resistivity, magnetoresistivity (for a field below 8 T), thermoelectric power and thermal conductivity measured each time on the same sample, are reported. The markedly different behaviour of the x=0.1 sample from those with a smaller Ga content, is discussed. The dilution of the Mn3+/Mn4+ interactions with Ga doping considerably reduces the ferromagnetic double exchange interaction within the manganese lattice leading to a decrease of the Curie temperature. The polaron binding energy varies from 224 to 243 meV with increased Ga doping. |
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| Keywords: | Ga doped manganites Colossal magnetoresistance Thermoelectric power Thermal conductivity |
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