Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2

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dc.creatorTanatar, M. A.
dc.creatorNi, N.
dc.creatorMartin, C.
dc.creatorGordon, R. T.
dc.creatorKim, H.
dc.creatorKogan, V. G.
dc.creatorSamolyuk, G. D.
dc.creatorBud'ko, S. L.
dc.creatorCanfield, P. C.
dc.creatorProzorov, R.
dc.date2008-12-30
dc.date.accessioned2026-07-07T12:49:33Z
dc.date.available2026-07-07T12:49:33Z
dc.descriptionAnisotropies of electrical resistivity, upper critical field, London penetration depth and critical currents have been measured in single crystals of the optimally doped iron pnictide superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$, $x$=0.074 and $T_c \sim$23 K. The normal state resistivity anisotropy was obtained by employing both the Montgomery technique and direct measurements on samples cut along principal crystallographic directions. The ratio $γ_ρ = ρ_c /ρ_a$ is about 4$\pm$1 just above $T_c$ and becomes half of that at room temperature. The anisotropy of the upper critical field, $γ_{H} = H_{c2,ab} /H_{c2,c} $, as determined from specific heat measurements close to $T_c$, is in the range of 2.1 to 2.6, depending on the criterion used. A comparable low anisotropy of the London penetration depth, $γ_λ=λ_{c}/λ_{ab}$, was recorded from TDR measurements and found to persist deep into the superconducting state. An anisotropy of comparable magnitude was also found in the critical currents, $γ_j=j_{c,ab}/j_{c,c}$, as determined from both direct transport measurements ($\sim$1.5) and from the analysis of the magnetization data ($\sim$3). Overall, our results show that iron pnictide superconductors manifest anisotropies consistent with essentially three-dimensional intermetallic compound and bear little resemblance to cuprates.
dc.identifierhttps://arxiv.org/abs/0812.4991
dc.identifierhttp://arxiv.org/abs/0812.4991
dc.identifierPhys. Rev. B 79, 094507 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.094507
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222440
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleAnisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2
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