2009/09/22 by R. Prozorov, M. A. Tanatar, N. Ni +8 · 2 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Anisotropy #Condensed matter physics #Corporate Taxation and Avoidance #Diffraction #Distortion (music) #Domain (mathematical analysis) #Iron-based superconductors research #Materials science #Optics #Optoelectronics #Orthorhombic crystal system #Phase (matter) #Phase diagram #Physics #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.80.174517
published as Phys. Rev. B 80, 174517 (2009) · estimation of Jc corrected
arxiv created 2009/09/22 · openalex publication_date 2009/11/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Critical current density was studied in single crystals of Ba(Fe_1\ensuremath-xCox)2As2 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.