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Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2 | M. A. Tanatar
; N. Ni
; C. Martin
; R. T. Gordon
; H. Kim
; V. G. Kogan
; G. D. Samolyuk
; S. L. Bud'ko
; P. C. Canfield
; R. Prozorov
; | Date: |
30 Dec 2008 | Abstract: | Anisotropies 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 $gamma_{
ho} =
ho_c /
ho_a$ is about 4$pm$1 just
above $T_c$ and becomes half of that at room temperature. The anisotropy of the
upper critical field, $gamma_{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, $gamma_{lambda}=lambda_{c}/lambda_{ab}$, 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,
$gamma_j=j_{c,ab}/j_{c,c}$, 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. | Source: | arXiv, 0812.4991 | Services: | Forum | Review | PDF | Favorites |
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