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Effect of Ga doping on magnetotransport properties in collosal magnetoresistive La0.7Ca0.3Mn1-xGaxO3 (0 < x < 0.1) | | Marek Pekala
; Jan Mucha
; Benedicte Vertruyen
; Rudi Cloots
; Marcel Ausloos
; | | Date: |
16 Jun 2006 | | Subject: | Strongly Correlated Electrons; Materials Science | | 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 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. | | Source: | arXiv, cond-mat/0606440 | | Services: | Forum | Review | PDF | Favorites | |
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