Spatial mobility fluctuation induced giant linear magnetoresistance in multilayered graphene foam

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	Spatial mobility fluctuation induced giant linear magnetoresistance in multilayered graphene foam
	Li, Peng; Zhang, Qiang; He, Xin; Ren, Wencai; Cheng, Hui-Ming; Zhang, Xi-xiang; Zhang, XX (reprint author), KAUST, Div Phys Sci & Engn, Thuwal 23955, Saudi Arabia.
	2016-07-05
发表期刊	PHYSICAL REVIEW B
ISSN	2469-9950
卷号	94 期号:4
摘要	Giant, positive, and near-temperature-independent linear magnetoresistance (LMR), as large as 340%, was observed in graphene foam with a three-dimensional flexible network. Careful analysis of the magnetoresistance revealed that Shubnikov-de Haas (SdH) oscillations occurred at low temperatures and decayed with increasing temperature. The average classical mobility ranged from 300 (2 K) to 150 (300 K) cm(2) V-1 s(-1), which is much smaller than that required by the observed SdH oscillations. To understand the mechanism behind the observation, we performed the same measurements on the microsized graphene sheets that constitute the graphene foam. Much more pronounced SdH oscillations superimposed on the LMR background were observed in these microscaled samples, which correspond to a quantum mobility as high as 26,500 cm(2) V-1 s(-1). Moreover, the spatial mobility fluctuated significantly from 64,200 cm(2) V-1 s(-1) to 1370 cm(2) V-1 s(-1), accompanied by a variation of magnetoresistance from near 20,000% to less than 20%. The presence of SdH oscillations actually excludes the possibility that the observed LMR originated from the extreme quantum limit, because this would demand all electrons to be in the first Landau level. Instead, we ascribe the large LMR to the second case of the classical Parish and Littlewood model, in which spatial mobility fluctuation dominates electrical transport. This is an experimental confirmation of the Parish and Littlewood model by measuring the local mobility randomly (by measuring the microsized graphene sheets) and finding the spatial mobility fluctuation.
部门归属	[li, peng ; zhang, qiang ; he, xin ; zhang, xi-xiang] kaust, div phys sci & engn, thuwal 23955, saudi arabia ; [ren, wencai ; cheng, hui-ming] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china
学科领域	Physics
资助者	Saudi Basic Industries Corporation (SABIC) Postdoctoral Fellowship Award in the Kingdom of Saudi Arabia; National Natural Science Foundation of China [51221264]; Ministry of Science and Technology of China [2012AA030303]; Chinese Academy of Sciences [KGZD-EW-303-1, KGZD-EW-T06]; King Abdullah University of Science and Technology
收录类别	sci
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75799
专题	中国科学院金属研究所
通讯作者	Zhang, XX (reprint author), KAUST, Div Phys Sci & Engn, Thuwal 23955, Saudi Arabia.
推荐引用方式 GB/T 7714	Li, Peng,Zhang, Qiang,He, Xin,et al. Spatial mobility fluctuation induced giant linear magnetoresistance in multilayered graphene foam[J]. PHYSICAL REVIEW B,2016,94(4).
APA	Li, Peng.,Zhang, Qiang.,He, Xin.,Ren, Wencai.,Cheng, Hui-Ming.,...&Zhang, XX .(2016).Spatial mobility fluctuation induced giant linear magnetoresistance in multilayered graphene foam.PHYSICAL REVIEW B,94(4).
MLA	Li, Peng,et al."Spatial mobility fluctuation induced giant linear magnetoresistance in multilayered graphene foam".PHYSICAL REVIEW B 94.4(2016).