Physics – Condensed Matter – Superconductivity
Scientific paper
2009-09-04
Phys. Rev. B 80, 174517 (2009)
Physics
Condensed Matter
Superconductivity
estimation of Jc corrected
Scientific paper
10.1103/PhysRevB.80.174517
Critical current density was studied in single crystals of Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ for the values of $x$ spanning the entire doping phase diagram. A noticeable enhancement was found for slightly underdoped crystals with the peak at $x = 0.058$. Using a combination of polarized-light imaging, x-ray diffraction and magnetic measurements we associate this behavior with the intrinsic pinning on structural domains in the orthorhombic phase. Domain walls extend throughout the sample thickness in the direction of vortices and act as extended pinning centers. With the increasing $x$ domain structure becomes more intertwined and fine due to a decrease of the orthorhombic distortion. This results in the energy landscape with maze-like spatial modulations favorable for pinning. This finding shows that iron-based pnictide superconductors, characterized by high values of the transition temperature, high upper critical fields, and low anisotropy may intrinsically have relatively high critical current densities.
Bud'ko Sergey L.
Canfield Paul. C.
Goldman Alan I.
Kreyssig Andreas
Nandi Satyanarayan
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