6 papers
Significant enhancement of irreversibility field in clean-limit bulk MgB2
V. Braccini, L. D. Cooley, S. Patnaik +4
Low resistivity ("clean") MgB2 bulk samples annealed in Mg vapor show an increase in upper critical field Hc2(T) and irreversibility field Hirr(T) by a factor of 2 in both transpor…
High Critical Current Density and Improved Irreversibility Field in Bulk MgB2 Made By A Scaleable, Nanoparticle Addition Route
J. Wang, Y. Bugoslavsky, A. Berenov +7
Bulk samples of MgB2 were prepared with 5, 10, and 15% wt.% Y2O3 nanoparticles added using a simple solid-state reaction route. Transmission electron microscopy (TEM) showed a fine…
Synthesis and Properties of c-axis Oriented Epitaxial MgB2 Thin Films
S. D. Bu, D. M. Kim, J. H. Choi +10
We report the growth and properties of epitaxial MgB2 thin films on (0001) Al2O3 substrates. The MgB2 thin films were prepared by depositing boron films via RF magnetron sputtering…
Core pinning by intragranular nanoprecipitates in polycrystalline MgCNi_3
L. D. Cooley, X. Song, J. Jiang +4
The nanostructure and magnetic properties of polycrystalline MgCNi_3 were studied by x-ray diffraction, electron microscopy, and vibrating sample magnetometry. While the bulk flux-…
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…
Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
D. C. Larbalestier, M. O. Rikel, L. D. Cooley +19
The discovery of superconductivity at 39 K in MgB2[1] raises many issues. One of the central questions is whether this new superconductor resembles a high-temperature-cuprate super…