Journal
PHYSICAL REVIEW B
Volume 80, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.174517
Keywords
barium compounds; cobalt compounds; critical current density (superconductivity); doping; flux pinning; iron compounds; magnetic anisotropy; magnetic domain walls; phase diagrams; superconducting critical field; superconducting materials; superconducting transition temperature; X-ray diffraction
Funding
- Department of Energy- Basic Energy Sciences [DE- AC02- 07CH11358]
- U. S. DOE [DE- AC02- 06CH11357]
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Critical current density was studied in single crystals of Ba(Fe1-xCox)(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 in the orthorhombic distortion. This results in the energy landscape with mazelike 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.
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