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We theoretically study the temperature dependence of TMR in half-metallic manganite tunnel junctions. By performing numerical simulation based on linear response theory, it is shown that the effects of spin fluctuations on TMR are small and that the MR ratio remains at high temperatures near bulk TC. We deduce that the disappearance of the MR ratio at temperatures far below TC in experiments originates from a change in the interface electronic structure and magnetism.

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