High critical current densities in superconducting MgB2 thin films

Abstract

Superconducting MgB2 thin films were prepared on Al2O3(0001) and MgO(100) substrates. Boron thin films were deposited by the electron-beam evaporation followed by post-annealing process with magnesium. Proper post annealing conditions were investigated to grow good superconducting MgB2 thin films. The X-ray diffraction patterns showed randomly orientated growth of MgB2 phase in our thin films. The surface morphology was examined by scanning electron microscope (SEM) and atomic force microscope (AFM). Critical current density (Jc) measured by transport method was about 10^7 A/cm^2 at 15 K, and superconducting transition temperature (Tc) was ~ 39 K in the MgB2 thin films on Al2O3.

13 pages, 4 figures, submitted on Apr. 4, 2001, only one pdf file

References in corpus (5)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity in Dense $Mg{B}_2$ Wires
• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
• MgB2 superconducting thin films with a transition temperature of 39 Kelvin

Cited by in corpus (13)

• In-situ growth of superconducting MgB2 thin films by molecular beam epitaxy
• Current-Induced Pair Breaking in Magnesium Diboride
• Significant Reduction of the Microwave Surface Resistance of MgB2 Films by Surface Ion Milling
• The pair-breaking critical current density of magnesium diboride
• A Directly Coupled Superconducting Quantum Interference Device Magnetometer Fabricated in Magnesium Diboride by Focused Ion Beam
• Disorder induced collapse of the electron phonon coupling in MgB${}_2$ observed by Raman Spectroscopy
• Nanogranular MgB2 thin films on SiC buffered Si substrates prepared by in-situ method
• Effects of the Two- Gap Nature on the Microwave Conductivity of 39 K Polycrystalline MgB2 Films
• Tunnel junctions on as-grown superconducting MgB2 thin films
• Electrical transport properties of bulk MgB2 materials synthesized by the electrolysis on fused mixtures of MgCl2, NaCl, KCl and MgB2O4
• Effects of Ion Milling on the Microwave Properties of MgB2 Films
• 3D modeling of magnetic atom traps on type-II superconductor chips
• Josephson effects in MgB2 meta masked ion damage junctions