Magnetization studies on superconducting MgB${}_2$ - lower and upper critical fields and critical current density

Abstract

Magnetization studies have been carried out on superconducting MgB${}_2$ (T${}_c$=37K) in the temperature range of 2-50K and in magnetic field up to 5 Tesla. From these measurements, values of the lower critical field H${}_{c}1$(0), upper critical field H${}_{c}2$(0) at zero K are estimated to be ~300 Oe and ~12.5 Tesla, respectively, which yield a value of ~26 for the Ginzburg-Landau parameter, k. Magnetization hysteresis loops have been obtained at various temperatures from which the magnetization critical current density is estimated using Bean's critical state model.

7 pages, 6 figures, to be publihed in Solid State Communications (2001) [in press]

References in corpus (7)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
• Synthesis and Processing of $Mg{B}_2$ powders and wires
• Flux dynamics and vortex phase diagram of the new superconductor $Mg{B}_2$
• Strong quantum fluctuation of vortices in the new superconductor $Mg{B}_2$

Cited by in corpus (7)

• High Density MgB2 Obtained by Reactive Liquid Mg Infiltration
• Effect of La Doping on Microstructure and Critical Current Density of MgB2
• Temperature and Field Dependence of the Energy Gap of MgB2/Pb planar junction
• A Magnetization and Microwave Study of Superconducting MgB2
• Doping dependence of the upper critical field, superconducting current density and thermally activated flux flow activation energy in polycrystalline CeFeAsO1-xFx superconductors
• An improved parametric model for hysteresis loop approximation
• Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity