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Relationship of Polaron Exchange with Ferromagnetic and Insulator--Metal Transitions in Doped Manganites |
CHEN Li-Ping, MA Yu-Bin, SONG Xian-Feng, LIAN Gui-Jun, ZHANG Yan, XIONG
Guang-Cheng |
| School of Physics, Peking University, Beijing 100871 |
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| Cite this article: |
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CHEN Li-Ping, MA Yu-Bin, SONG Xian-Feng et al 2008 Chin. Phys. Lett. 25 3381-3384 |
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Abstract We report the experiment results and data analyses based on a polaron exchange model for La0.7Ca0.3MnO3 and Pr0.7(Sr1-xCax)0.3MnO3 epitaxial thin films. In the polaron exchange model with an energy balance condition, critical temperature of TC for stable ferromagnetic (FM) ordering should depend on ∆ E as kBTC =E0 exp(-ΔE/kBTC), where ∆ E denotes the potential barrier for the exchange polarons to overcome. Using the small polaron hopping model, the resistivity peak temperature TP is a function of the hopping energy Ehop. The dependence of TP on Ehop is similar to the dependence of TC on ∆ E, which reveals that the polaron exchange relates to FM and insulator--metal transitions. The result indicates that the polaron exchange model is a simple way for describing the FM ordering, and is very helpful for understanding of complex doped manganites.
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| Keywords:
73.20.Mf
73.43.Qt
73.50.-h
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Received: 15 May 2008
Published: 29 August 2008
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| PACS: |
73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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73.43.Qt
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(Magnetoresistance)
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73.50.-h
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(Electronic transport phenomena in thin films)
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