SrFeAsF as a parent compound for iron pnictide superconductors

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dc.creatorHan, Fei
dc.creatorZhu, Xiyu
dc.creatorMu, Gang
dc.creatorCheng, Peng
dc.creatorWen, Hai-Hu
dc.date2008-10-14
dc.date2008-10-30
dc.date.accessioned2026-07-07T10:17:22Z
dc.date.available2026-07-07T10:17:22Z
dc.descriptionWe have successfully synthesized the fluo-arsenide SrFeAsF, a new parent phase with the ZrCuAsSi structure. The temperature dependence of resistivity and dc magnetization both reveal an anomaly at about T_{an} = 173 K, which may correspond to the structural and/or Spin-Density-Wave (SDW) transition. Strong Hall effect and magnetoresistance were observed below T_{an}. Interestingly, the Hall coefficient R_H is positive below T_{an}, which is opposite to the cases in the two parent phases of FeAs-based systems known so far, i.e., LnFeAsO (Ln = rare earth elements) and (Ba, Sr)Fe_2As_2 where the Hall coefficient R_H is negative. This strongly suggests that the gapping to the Fermi surfaces induced by the SDW order is more complex than we believed before that it removes the density of states on some Fermi pockets and leaves one of the electron pockets less-gapped or un-gapped. Our data clearly show that it is possible for the parent phase to have electron-like or hole-like charge carriers.
dc.description4 pages, 4 figures, to be published in Phys. Rev. B as a Rapid Communication
dc.identifierhttps://arxiv.org/abs/0810.2475
dc.identifierhttp://arxiv.org/abs/0810.2475
dc.identifierpublished in Phys. Rev. B 78, 180503(R) (2008)
dc.identifierdoi:10.1103/PhysRevB.78.180503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/173833
dc.subjectSuperconductivity
dc.titleSrFeAsF as a parent compound for iron pnictide superconductors
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