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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
Source PublicationPHYSICAL REVIEW B
ISSN2469-9950
Volume94Issue:4
AbstractGiant, 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.
description.department[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
Subject AreaPhysics
Funding OrganizationSaudi 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
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/75799
Collection中国科学院金属研究所
Corresponding AuthorZhang, XX (reprint author), KAUST, Div Phys Sci & Engn, Thuwal 23955, Saudi Arabia.
Recommended Citation
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).
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