Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystals

doi:10.1038/srep00750

Affiliated with RC	false
Status	已發表Published
	Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystals
	Li H.3; Xiao Y.4; Schmitz B.4; Persson J.4; Schmidt W.3; Meuffels P.2; Roth G.1; Bruckel T.4
	2012-11-07
Source Publication	Scientific Reports
ISSN	20452322
Volume	2
Abstract	Magnetoresistance (MR) has attracted tremendous attention for possible technological applications. Understanding the role of magnetism in manipulating MR may in turn steer the searching for new applicable MR materials. Here we show that antiferromagnetic (AFM) GdSi metal displays an anisotropic positive MR value (PMRV), up to ∼415%, accompanied by a large negative thermal volume expansion (NTVE). Around T N the PMRV translates to negative, down to ∼-10.5%. Their theory-breaking magnetic-field dependencies [PMRV: dominantly linear; negative MR value (NMRV): quadratic] and the unusual NTVE indicate that PMRV is induced by the formation of magnetic polarons in 5d bands, whereas NMRV is possibly due to abated electron-spin scattering resulting from magnetic-field-Aligned local 4f spins. Our results may open up a new avenue of searching for giant MR materials by suppressing the AFM transition temperature, opposite the case in manganites, and provide a promising approach to novel magnetic and electric devices.
DOI	10.1038/srep00750
URL	View the original
Language	英語English
Fulltext Access	View Full-Text via DOI View Full-Text via Web of Science View Full-Text via Scopus
Citation statistics	Cited Times [WOS]:19 [WOS Record] [Related Records in WOS]
Document Type	Journal article
Collection	University of Macau
Affiliation	1.Rheinisch-Westfälische Technische Hochschule Aachen 2.Forschungszentrum Jülich (FZJ) 3.Institut Laue-Langevin 4.JARA-FIT
Recommended Citation GB/T 7714	Li H.,Xiao Y.,Schmitz B.,et al. Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystals[J]. Scientific Reports,2012,2.
APA	Li H.,Xiao Y.,Schmitz B.,Persson J.,Schmidt W.,Meuffels P.,Roth G.,&Bruckel T..(2012).Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystals.Scientific Reports,2.
MLA	Li H.,et al."Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystals".Scientific Reports 2(2012).

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