Dimensionality and pinning of magnetic vortices in thec-axis alignedBi2Sr2

Effects of fission-fragment damage on vortex dimensionality in silver-sheathedBi2Sr2CaMarinaro1, Horvat2, Dou3 et al. 2003Phys. Rev. B2220View full textAdd to dashboardCite

“…7 There is mounting evidence that parallel columnar defects created across the layers of anisotropic HTSs increase the interlayer vortex coherence, promoting a 3D linelike behavior, by suppressing the effects of thermal fluctuations on the pancake positions. 8 This effect has been observed in heavyion irradiation studies on Bi2212 single crystals 9 and thin films, 3 Tl 2 Ba 2 CaCu 2 O x ͑Tl2212͒ thin films, 10 and Bi-Sr-CaCu-O ͑BSCCO͒ tapes, 11 using diverse methods such as Josephson plasma resonance, 9 resistive dissipation, 10 and J c () scaling. 11 The studies of transport J c () scaling with B Ќ , 11 the component of an applied field perpendicular to the tape ab plane, identified an increase in the 3D linelike vortex state in both Ag/Bi2223 and Ag/Bi2212 tapes with parallel columnar defects.…”

“…11 The effect of random splay on the vortex coherence in Bi2223, however, has not been experimentally resolved.…”

Physicochemical methods of enhancing the performance of high-Tc superconductors

“…Bombardment with such ions produces columnar defects-well-defined, heavily amorphized tracks typically 50-70 Å in size-which are capable of acting as efficient pinning sites. In recent years, the focus of research has gradually shifted from model experiments dealing with films, single crystals, and textured polycrystalline materials to assessing the effect of radiation-induced defects on the superconducting properties of high-T c composites [13][14][15]. Note that enhancing the critical current density in silver-clad composites via high-energy ion irradiation presents formidable technical problems, first, because high-power, costly accelerators must be used and, second, because the projected range is relatively short even at very high ion energies, so that one has, in some instances, to thin or fully remove the silver cladding.…”

Effect of MgO Nanorod Doping on Phase Formation and Intergrain Coupling of (Bi, Pb)-2223 Superconductors

“…Although the irradiation of proton [9], neutron [10,11], or heavy ions [12] can produce columnar defects with an average diameter of 20 nm and result in large enhancement of flux pinning, it is not very practical for large scale applications. Fossheim et al [13] introduced carbon nanotubes into Bi-2212 superconductors for the first time and observed enhanced flux pinning.…”