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Study of the free energy of the La1-xCaxMnO3 manganites based on the temperature dependence of the crystal cell volume

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9 Author(s)
Tang, G.D. ; Department of Physics, Hebei Normal University, Shijiazhuang 050016, People’s Republic of China and Hebei Advanced Thin Films Laboratory, Shijiazhuang 050016, People’s Republic of China ; Liu, S.P. ; Zhao, X. ; Zhang, Y.G.
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A study of the free energy of the perovskite manganites was performed by fitting experimental results for the temperature dependence of the crystal cell volume using a detailed semiclassical model of the free energy. The fitted results coincide with the experimental results for the samples La1-xCaxMnO3 (x=0.2, 0.25, 0.3, and 0.5). The free energy includes the energy corresponding to thermal vibration of the crystal lattice, the ionic cohesive energy, and additional energies produced by electrical carriers from the double exchange mechanism and the thermal activation of small polarons.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 12 )

Date of Publication:

Sep 2009

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