Effect of oxygen content on the transport properties and magnetoresistance in [Ca₂CoO₃₋δ]₀.₆₂[CoO₂] single crystals
Luo, X. G. · Chen, X. H. · Wang, G. Y. · Wang, C. H. · Xiong, Y. M. · Song, H. B. · Li, H. · Lu, X. X.
الأصل · EN
Transport property is investigated in [Ca₂CoO₃₋δ]₀.₆₂[CoO₂] single crystals obtained by varying annealing conditions. The ρab(T) exhibits a resistivity minimum, and the temperature corresponding to this minimum increases with the loss of oxygen content, indicative of the enhancement of spin density wave (SDW). Large negative magnetoresistance (MR) was observed in all single crystals [Ca₂CoO₃₋δ]₀.₆₂[CoO₂], while a magnetic-field-driven insulator-to-metal (IM) transition in oxygen annealed samples. These results suggest a ferromagnetic correlation in system enhanced by oxygen content. In addition, a low temperature thermal activation resistivity induced by fields was observed in single crystals annealed in oxygen atmosphere.
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