Superconductivity induced by cobalt doping in iron-based oxyarsenides

Simple item page
dc.creatorCao, Guanghan
dc.creatorWang, Cao
dc.creatorZhu, Zengwei
dc.creatorJiang, Shuai
dc.creatorLuo, Yongkang
dc.creatorRen, Shun Chi Zhi
dc.creatorTao, Qian
dc.creatorWang, Yuetao
dc.creatorXu, Zhu'an
dc.date2008-07-08
dc.date2008-07-15
dc.date.accessioned2026-07-07T12:44:25Z
dc.date.available2026-07-07T12:44:25Z
dc.descriptionChemical doping has recently become a very important strategy to induce superconductivity especially in complex compounds. Distinguished examples include Ba-doped La$_2$CuO$_4$ (the first high temperature superconductor), K-doped BaBiO$_3$, K-doped C$_{60}$ and Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O. The most recent example is F-doped LaFeAsO, which leads to a new class of high temperature superconductors. One notes that all the above dopants are non-magnetic, because magnetic atoms generally break superconducting Cooper pairs. In addition, the doping site was out of the (super)conducting structural unit (layer or framework). Here we report that superconductivity was realized by doping magnetic element cobalt into the (super)conducting-active Fe$_2$As$_2$ layers in LaFe$_{1-x}$Co$_{x}$AsO. At surprisingly small Co-doping level of $x$=0.025, the antiferromagnetic spin-density-wave transition in the parent compound is completely suppressed, and superconductivity with $T_c\sim $ 10 K emerges. With increasing Co content, $T_c$ shows a maximum of 13 K at $x\sim 0.075$, and then drops to below 2 K at $x$=0.15. This result suggests essential differences between previous cuprate superconductor and the present iron-based arsenide one.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0807.1304
dc.identifierhttp://arxiv.org/abs/0807.1304
dc.identifierPHYSICAL REVIEW B 79, 054521 (2009). [Combined with arXiv:0808.3254]
dc.identifierdoi:10.1103/PhysRevB.79.054521
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220766
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleSuperconductivity induced by cobalt doping in iron-based oxyarsenides
dc.typetext

Files

Collections

arXiv