Anomalous magnetoresistance in [ Sr 2 Bi 2-x Pb x O 4 ] RS [ CoO 2 ] y (x=0, 0.3, and 0.4; y ≈ 1.85) single crystals

X. G. Luo, X. H. Chen (), G. Y. Wang, C. H. Wang, X. Li, G. Wu and Y. M. Xiong

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 49, issue 1, 37-45

Abstract: Magnetoresistance (MR) of the [ Sr 2 Bi 2-x Pb x O 4 ] RS [ CoO 2 ] y (x=0, 0.3, and 0.4; y ≈ 1.85; RS is referred to rocksalt block) single crystals is investigated systematically. A nonmonotonic variation of the isothermal in-plane and out-of-plane MR with the field is observed. The out-of-plane MR is positive at high temperatures and increases with decreasing T, and exhibits a pronounced hump, then changes the sign from positive to negative at a certain temperature. These results strongly suggest that the observed MR consists of two contributions: one negative and one positive component. The isothermal MR in high magnetic fields follows a H 2 law. The negative contribution comes from spin scattering of carriers by localized-magnetic-moments based on the Khosla-Fischer model. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Date: 2006
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DOI: 10.1140/epjb/e2006-00027-y

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