Synthesis and Magnetotransport Properties of CrO<sub>2</sub>-TiO<sub>2</sub> Composites

doi:10.1088/0256-307X/30/3/037502

Chin. Phys. Lett.

2013, Vol. 30

Issue (3): 037502 DOI: 10.1088/0256-307X/30/3/037502

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Synthesis and Magnetotransport Properties of CrO₂-TiO₂ Composites

FAN Yin-Bo¹, ZHANG Cai-Ping¹, DU Xiao-Bo², WEN Ge-Hui^1**, MA Hong-An¹, JIA Xiao-Peng¹

¹State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012
²College of Physics, Jilin University, Changchun 130012

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FAN Yin-Bo, ZHANG Cai-Ping, DU Xiao-Bo et al 2013 Chin. Phys. Lett. 30 037502

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Abstract CrO₂-TiO₂ composites are synthesized by using a high temperature and high pressure method using CrO₃ and H₂TiO₃ as precursors. The composites consist of large rod-like CrO₂ crystals separated by small TiO₂ grains. The CrO₂ in the composites is very pure and its saturation magnetization is very close to the theoretical value (i.e., 2μ_B per formula unit). The composites exhibit a large negative magnetoresistance (MR) at 5 K. The MR in CrO₂-TiO₂ composites is mainly attributed to spin-polarized tunneling between CrO₂ crystals. The conductivity of the composites is best described by a fluctuation-induced tunneling model below 230 K.

Received: 20 September 2012 Published: 29 March 2013

PACS:	75.47.-m	(Magnetotransport phenomena; materials for magnetotransport)
	73.43.Qt	(Magnetoresistance)
	72.80.Tm	(Composite materials)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/30/3/037502 OR https://cpl.iphy.ac.cn/Y2013/V30/I3/037502

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	FAN Yin-Bo
	ZHANG Cai-Ping
	DU Xiao-Bo
	WEN Ge-Hui
	MA Hong-An
	JIA Xiao-Peng

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