Transport and anisotropy in single-crystalline SrFe$_2$As$_2$ and $A_{0.6}$K$_{0.4}$Fe$_2$As$_2$ ($A$ = Sr, Ba) superconductors

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dc.creatorChen, G. F.
dc.creatorLi, Z.
dc.creatorDong, J.
dc.creatorLi, G.
dc.creatorHu, W. Z.
dc.creatorZhang, X. D.
dc.creatorSong, X. H.
dc.creatorZheng, P.
dc.creatorWang, N. L.
dc.creatorLuo, J. L.
dc.date2008-06-16
dc.date2008-11-21
dc.date.accessioned2026-07-07T12:10:34Z
dc.date.available2026-07-07T12:10:34Z
dc.descriptionWe have successfully grown high quality single crystals of SrFe$_2$As$_2$ and A$_{0.6}$K$_{0.4}$Fe$_2$As$_2$(A=Sr, Ba) using flux method. The resistivity, specific heat and Hall coefficient have been measured. For parent compound SrFe$_2$As$_2$, an anisotropic resistivity with $ρ_c$ / $ρ_{ab}$ as large as 130 is obtained at low temperatures. A sharp drop in both in-plane and out-plane resistivity due to the SDW instability is observed below 200 K. The angular dependence of in-plane magnetoresistance shows 2-fold symmetry with field rotating within ab plane below SDW transition temperature. This is consistent with a stripe-type spin ordering in SDW state. In K doped A$_{0.6}$K$_{0.4}$Fe$_2$As$_2$(A=Sr. Ba), the SDW instability is suppressed and the superconductivity appears with T$_c$ above 35 K. The rather low anisotropy in upper critical field between H$\parallel$ab and H$\parallel$c indicates inter-plane coupling play an important role in hole doped Fe-based superconductors.
dc.description12 pages, 6 figures. Accepted by Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0806.2648
dc.identifierhttp://arxiv.org/abs/0806.2648
dc.identifierPhys. Rev. B 78, 224512 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.224512
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/209970
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleTransport and anisotropy in single-crystalline SrFe$_2$As$_2$ and $A_{0.6}$K$_{0.4}$Fe$_2$As$_2$ ($A$ = Sr, Ba) superconductors
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