Abstract
Chemical solution deposition as an alternative method for colossal magnetoresistance films is used to prepare the La0.8Na0.1A0.1MnO3 (A = Ca, Na, Sr) on single crystalline LaAlO3 (h00) substrates. The results show that all the derived films are highly (h00)-oriented and have rather large magnetoresistance values near the room temperature. Moreover, for the three films, it is found that the insulator–metal transition temperature (TIM) is higher than that of the paramagnetic–ferromagnetic transition (Tc). It is interesting to find that in the Na-doped manganites the maximum MR value and TIM as well as Tc can be synchronously improved.
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