Publications (9)
A new approach for improving global critical current density in Fe(Se0.5Te0.5) polycrystalline materials
A. Palenzona, A. Sala, C. Bernini +13
A novel method to prepare bulk Fe(Se0.5Te0.5) samples is presented, based on a melting process and a subsequent annealing treatment. With respect to the standard sintering techniqu…
Template engineering of Co-doped BaFe2As2 single-crystal thin films
S. Lee, J. Jiang, C. T. Nelson +14
Understanding new superconductors requires high-quality epitaxial thin films to explore intrinsic electromagnetic properties, control grain boundaries and strain effects, and evalu…
Magnetization Losses in Multiply Connected YBa2Cu3O6+x Coated Conductors
G. A. Levin, P. N. Barnes, Naoyuki Amemiya +4
We report the results of a magnetization losses study in experimental multifilament, multiply connected coated superconductors exposed to time-varying magnetic field. In these samp…
Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films
C. Tarantini, S. Lee, Y. Zhang +13
We report measurements of the field and angular dependences of Jc of truly epitaxial Co-doped BaFe2As2 thin films grown on SrTiO3/(La,Sr)(Al,Ta)O3 with different SrTiO3 template th…
Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals
S. Lee, J. Jiang, J. D. Weiss +17
We show that despite the low anisotropy, strong vortex pinning and high irreversibility field Hirr close to the upper critical field Hc2 of Ba(Fe1-xCox)2As2, the critical current d…
Evidence for electromagnetic granularity in polycrystalline Sm1111 iron-pnictides with enhanced phase purity
A. Yamamoto, J. Jiang, F. Kametani +7
We prepared polycrystalline SmFeAsO1-xFx (Sm1111) bulk samples by sintering and hot isostatic pressing (HIP) in order to study the effects of phase purity and relative density on t…
Local Measurement of Current Density by Magneto-Optical Current Reconstruction in Normally and Overpressure Processed Bi-2223 Tapes
S. Patnaik, D. M. Feldmann, A. Polyanskii +6
Magneto-optical current reconstruction has been used for detailed analysis of the local critical current density (Jc) variation in monocore Bi-2223 tapes. We find, even in high qua…
Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
C. B. Eom, M. K. Lee, J. H. Choi +22
The discovery of superconductivity at 39 K in magnesium diboride offers the possibility of a new class of low-cost, high-performance superconducting materials for magnets and elect…
Effect of grain refinement on enhancing critical current density and upper critical field in undoped MgB2 ex-situ tapes
A. Malagoli, V. Braccini, M. Tropeano +9
Ex-situ Powder-In-Tube MgB2 tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field H*, the upper critical field Hc2 and the criti…