Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-06-16
Physics
Condensed Matter
Strongly Correlated Electrons
submitted to J Magnet Magnet Mater; 13 figures; 2 tables; 38 references
Scientific paper
10.1016/j.jmmm.2006.02.241
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 8T), thermoelectric power and thermal conductivity measured each time on the same sample, are reported. The markedly different behavior 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.
Ausloos Marcel
Cloots Rudi
Mucha Jan
Pekala Marek
Vertruyen Benedicte
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