Journal ArticleDOI
On Pinning of Superconducting Flux Lines by Grain Boundaries
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In this article, a simple model is developed which describes the reduction of the mean free path of conduction electrons in metals near a grain boundary, which leads to a decrease of the self-energy of flux lines in a layer which is considerably thicker than the perturbed zone of the boundary itself.Abstract:
A simple model is developed which describes the reduction of the mean free path of conduction electrons in metals near a grain boundary. This leads to a decrease of the self-energy of flux lines in a layer which is considerably thicker than the perturbed zone of the boundary itself. The model yields pinning forces which agree, within an order of magnitude, with recent measurements on niobium bicrystals, and with observed values of grain boundary pinning in Nb/sub 3/Sn.read more
Citations
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Magneto-optical studies of current distributions in high-Tc superconductors
TL;DR: In this paper, a review of the magneto-optical imaging technique and experiments on thin films, single crystals, polycrystalline bulk ceramics, tapes and melt-textured HTS materials is presented.
Journal ArticleDOI
The role of grain boundaries in determining J c in high-field high-current superconductors
TL;DR: The scaling laws that describe flux pinning in the two most common commercial superconductors, NbTi and Nb3Sn made by the bronze process, are totally different as mentioned in this paper.
Journal ArticleDOI
The behavior of grain boundaries in the Fe-based superconductors
John H. Durrell,Chang-Beom Eom,Alex Gurevich,Eric E. Hellstrom,Chiara Tarantini,Akiyasu Yamamoto,David C. Larbalestier +6 more
TL;DR: In this paper, the authors consider the positive role that grain boundaries (GBs) play in the metallic, low-temperature superconductors and then review the theoretical background and current experimental data relating to the properties of GBs.
Journal ArticleDOI
Limiting factors of normal-state conductivity in superconducting MgB2: an application of mean-field theory for a site percolation problem
TL;DR: In this article, normal state conductivity in polycrystalline MgB2 bulk samples having a systematically varied packing factor was studied and the packing factor dependence of phonon term resistivity was found to be well explained by the three-dimensional site percolation model.
Journal ArticleDOI
Transport properties and flux pinning by self-organization in YBa 2 Cu 3 O 7-δ films on vicinal SrTiO 3 (001)
T. Haage,Jörg Zegenhagen,J.Q. Li,H.-U. Habermeier,Manuel Cardona,Ch. Jooss,R. Warthmann,A. Forkl,Helmut Kronmüller +8 more
TL;DR: In this article, the authors demonstrate the influence of a periodic nanoscale step structure of the clean substrate surface on the morphology and defect microstructure of subsequently deposited YBCO films and demonstrate that the critical current density of high-temperature superconductors can be enhanced in a controlled way growing thin films on tailored substrate surfaces.
References
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Journal ArticleDOI
Flux vortices and transport currents in type II superconductors
A. M. Campbell,J. E. Evetts +1 more
TL;DR: In this paper, the authors considered the effects of lattice rigidity on the summation of pinning forces and showed that a summation based on statistical arguments uses the same approximations and leads to the same results as a dissipation argument.
Journal ArticleDOI
Superconducting Properties of High-Purity Niobium
TL;DR: Precision magnetization data for high-purity niobium metal samples were given in this article for both resistive and ac susceptibility measurements, and the magnetization curves are qualitatively like those associated with a type-II superconductor with a detailed shape that does not follow any theory.
Journal ArticleDOI
Flux pinning centers in superconducting Nb3Sn
TL;DR: In this article, the relative contributions of two types of pinning centers, grain boundaries and second phase particles, to flux pinning have been determined by correlating Jc with microstructure.
Superconductivity in metals and alloys
TL;DR: In this article, a method for the measurement of the interphase energy in superconductors is described along with preliminary results on thin foils and films of Sn. The application of this technique to the continuous deposition of Nb/sub 3/Sn on wire is described, and some superconducting properties of this wire are given.