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http://dx.doi.org/10.9714/psac.2018.20.1.028

Effect of chemical doping on heterostructured Fe-based superconductor Sr2VO3FeAs  

Ok, Jong Mok (Department of Physics, Pohang University of Science and Technology)
Na, Se Woong (Department of Physics, Pohang University of Science and Technology)
Kim, Jun Sung (Department of Physics, Pohang University of Science and Technology)
Publication Information
Progress in Superconductivity and Cryogenics / v.20, no.1, 2018 , pp. 28-31 More about this Journal
Abstract
Phase diagrams of electron- and hole-doped $Sr_2VO_3FeAs$ are investigated using Co and Mn substitution at Fe site. Metallic nature survives only for Co (electron) doping, not for Mn (hole) doping. The conductivity of $Sr_2VO_3(Fe,M)As$ (M=Mn,Co) is sensitive to the structural modification of FeAs microstructure rather than carrier doping. This finding implies that the FeAs layer plays a dominant role on the charge conduction, thus the $SrVO_3$ layers should be considered as an insulating block. Also, we found that the superconductivity is rapidly suppressed by both dopants. This result is different from the conventional behavior that superconductivity is induced by doping in the most of Fe pnictides. Our finding strongly supports the uniqueness of $Sr_2VO_3FeAs$ among the Fe pnictide superconductors.
Keywords
Fe based superconductor; chemical doping; $Sr_2VO_3FeAs$;
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