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Magnetic and transport properties of bilayered manganites La1.2Sr1.8Mn2-xGaxO7 (x=0, 0.08)* |
Zheng Lin(郑琳)a), Zhou Min(周敏)a), Zhao Jian-Jun(赵建军)a), Cheng Zhao-Hua(成昭华)b), Zhang Xiang-Qun(张向群)b), Xing Ru(邢茹)a), Zhang Xue-Feng(张雪峰)c), and Lu Yi(鲁毅)a)† |
a Department of Physics, Baotou Normal University, Baotou 014030, China; b State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; c Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources: Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, China
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Abstract The magnetic and electrical properties of nonmagnetic Ga+3 ion substitution for Mn site are investigated in the bilayer manganite La1.2Sr1.8Mn2O7. When the Mn is substituted by Ga, the ferromagnetic property obviously weakens, the magnetic transition temperature decreases and a spin-glass behaviour occurs at low temperature. Meanwhile, doping causes the resistivity to dramatically increase, the metal–insulator transition temperature to disappear, and a greater magneto-resistance effect to occur at low temperature. These effects result from the fact that Ga substitution dilutes the magnetic active Mn–O–Mn network and weakens the double exchange interaction, and further suppresses ferromagnetic ordering and metallic conduction.
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Received: 17 February 2011
Revised: 13 April 2011
Accepted manuscript online:
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PACS:
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75.30.Et
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(Exchange and superexchange interactions)
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73.40.Qt
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50862007) and the Inner Mongolia Natural Science Foundation of China (Grant No. 2009MS0101). |
Cite this article:
Zheng Lin(郑琳), Zhou Min(周敏), Zhao Jian-Jun(赵建军), Cheng Zhao-Hua(成昭华), Zhang Xiang-Qun(张向群), Xing Ru(邢茹), Zhang Xue-Feng(张雪峰), and Lu Yi(鲁毅) Magnetic and transport properties of bilayered manganites La1.2Sr1.8Mn2-xGaxO7 (x=0, 0.08)* 2011 Chin. Phys. B 20 087501
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