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

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

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.

Keywords: magnetic property electrical property magnetoresistance effect metal–insulator transition

Received: 17 February 2011
Revised: 13 April 2011
Accepted manuscript online:

PACS:	75.30.Et	(Exchange and superexchange interactions)
	73.40.Qt
	71.30.+h	(Metal-insulator transitions and other electronic transitions)

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

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

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