Magnetic and transport properties of bilayered manganites La1.2Sr1.8Mn2-xGaxO7 (x=0, 0.08)*

doi:10.1088/1674-1056/20/8/087501

中国物理B ›› 2011, Vol. 20 ›› Issue (8): 87501-087501.doi: 10.1088/1674-1056/20/8/087501

Magnetic and transport properties of bilayered manganites La_1.2Sr_1.8Mn_2-xGa_xO₇ (x=0, 0.08)^*

郑琳¹, 周敏¹, 赵建军¹, 邢茹¹, 鲁毅¹, 张雪峰², 成昭华³, 张向群³

(1)Department of Physics, Baotou Normal University, Baotou 014030, China; (2)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 vspace1mm; (3)State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2011-02-17 修回日期:2011-04-13 出版日期:2011-08-15 发布日期:2011-08-15
基金资助:
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).

Magnetic and transport properties of bilayered manganites La_1.2Sr_1.8Mn_2-xGa_xO₇ (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

Received:2011-02-17 Revised:2011-04-13 Online:2011-08-15 Published:2011-08-15
Supported by:
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).

摘要/Abstract

摘要： The magnetic and electrical properties of nonmagnetic Ga⁺³ ion substitution for Mn site are investigated in the bilayer manganite La_1.2Sr_1.8Mn₂O₇. 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.

关键词: magnetic property, electrical property, magnetoresistance effect, metal—insulator transition

Abstract: The magnetic and electrical properties of nonmagnetic Ga⁺³ ion substitution for Mn site are investigated in the bilayer manganite La_1.2Sr_1.8Mn₂O₇. 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.

Key words: magnetic property, electrical property, magnetoresistance effect, metal–insulator transition

中图分类号: (Exchange and superexchange interactions)

75.30.Et

71.30.+h (Metal-insulator transitions and other electronic transitions)

郑琳, 周敏, 赵建军, 成昭华, 张向群, 邢茹, 张雪峰, 鲁毅. Magnetic and transport properties of bilayered manganites La_1.2Sr_1.8Mn_2-xGa_xO₇ (x=0, 0.08)^*[J]. 中国物理B, 2011, 20(8): 87501-087501.

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 La_1.2Sr_1.8Mn_2-xGa_xO₇ (x=0, 0.08)^*[J]. Chin. Phys. B, 2011, 20(8): 87501-087501.

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Magnetic and transport properties of bilayered manganites La_1.2Sr_1.8Mn_2-xGa_xO₇ (x=0, 0.08)^*

Magnetic and transport properties of bilayered manganites La_1.2Sr_1.8Mn_2-xGa_xO₇ (x=0, 0.08)^*

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