Influence of hot pressure on the magnetoresistance of CrO(2)

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	Influence of hot pressure on the magnetoresistance of CrO(2)
	X. J. Wang; Y. Sui; X. D. Song; R. B. Zhu; Z. N. Qian; W. H. Su; J. K. Tang
	2007
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	101 期号:9
摘要	In this paper, we investigate the influence of high temperature and high pressure (hot pressure) on the magnetic and transport properties of polycrystalline CrO(2) samples compacted under high pressure and high temperature of up to 5 GPa and 600 degrees C, respectively. The magnetic moment increases with compacting temperature, and a metal-semiconductor transition is observed in hot-pressed samples, different from the cold-pressed samples. These results indicate that the formation of Cr(2)O(3) at the grain boundaries of CrO(2) is suppressed by hot pressure. The magnitude of low field magnetoresistance of up to 1 T at 5 K is enhanced first with the increase of compacting temperature and then decreased under higher compacting temperature. This result can be well explained by the change of spin-dependent tunneling at the modulated grain boundaries of CrO(2) due to the transformation from Cr(2)O(3) to CrO(2) under hot pressure. (c) 2007 American Institute of Physics.
部门归属	harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. univ new orleans, dept phys, new orleans, la 70148 usa.;sui, y (reprint author), harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china;suiyu@hit.edu.cn
关键词	Transition
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33878
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. J. Wang,Y. Sui,X. D. Song,et al. Influence of hot pressure on the magnetoresistance of CrO(2)[J]. Journal of Applied Physics,2007,101(9).
APA	X. J. Wang.,Y. Sui.,X. D. Song.,R. B. Zhu.,Z. N. Qian.,...&J. K. Tang.(2007).Influence of hot pressure on the magnetoresistance of CrO(2).Journal of Applied Physics,101(9).
MLA	X. J. Wang,et al."Influence of hot pressure on the magnetoresistance of CrO(2)".Journal of Applied Physics 101.9(2007).