La0.7Pr0.3MnO3 ceramic: An electron-doped colossal magnetoresistive manganite

Duan, Ping; Zhenghao Chen; Shouyu Dai; Zhou, Yueliang; Huiblin Lu; Kuijian Jin; Bolin Cheng
June 2004
Applied Physics Letters;6/7/2004, Vol. 84 Issue 23, p4741
Academic Journal
We report a study on the synthesis, electrical transport, and magnetic properties of Pr-doped LaMnO3 ceramic material. We have found that La1-xPrxMnO3+δ (x=0.3) synthesized using solid-state reaction shows semiconductor behavior, and no colossal magnetoresistance (CMR) effect; while it shows CMR behavior when it is annealed in a flowing argon at certain temperature (about 873 K), which suggests that La0.7Pr0.3MnO3+δ has been transferred to La0.7Pr0.3MnO3. The x-ray photoemission spectroscopy reveals that Pr ions are in a mixed-valence state of Pr4+ and Pr3+ in this compound. Therefore, La1-xPrxMnO3 (x=0.3) could be an electron-doped CMR manganite. © 2004 American Institute of Physics.


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