TY  - JOUR
AU  - Li, H.
AU  - Xiao, Y.
AU  - Schmitz, B.
AU  - Perßon, J.
AU  - Schmidt, W.
AU  - Meuffels, P.
AU  - Roth, G.
AU  - Brückel, T.
TI  - Possible magnetic-polaron-switched positive and negative magnetoresistance in the GdSi single crystals
JO  - Scientific Reports
VL  - 2
IS  - Art. No.750
SN  - 2045-2322
CY  - London
PB  - Nature Publishing Group
M1  - PreJuSER-23111
PY  - 2012
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:23087815
C2  - pmc:PMC3475993
UR  - <Go to ISI:>//WOS:000310448900004
DO  - DOI:10.1038/srep00750
UR  - https://juser.fz-juelich.de/record/23111
ER  -