Rigid vortices in MgB2

Abstract

Magnetic relaxation of high-pressure synthesized MgB${}_2$ bulks with different thickness is investigated. It is found that the superconducting dia-magnetic moment depends on time in a logarithmic way; the flux-creep activation energy decreases linearly with the current density (as expected by Kim-Anderson model); and the activation energy increases linearly with the thickness of sample when it is thinner than about 1 mm. These features suggest that the vortices in the MgB${}_2$ are rather rigid, and the pinning and creep can be well described by Kim-Anderson model.

Typo corrected & reference added

References in corpus (8)

• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• Suppression of Superconducting Critical Current Density by Small Flux Jumps in $Mg{B}_2$ Thin Films
• Lower Critical Field at Odds with A S-Wave Superconductivity in The New Superconductor $Mg{B}_2$
• Magnetic relaxation and critical current density of $Mg{B}_2$ thin films
• Dependence of the flux creep activation energy on current density and magnetic field for MgB2 superconductor
• Flux dynamics and vortex phase diagram of the new superconductor $Mg{B}_2$
• Symmetry and Temperature dependence of the Order parameter in MgB2 from point contact measurements
• Superconducting gap parameters of MgB2 obtained on MgB2/Ag and MgB2/In junctions

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• Thermally-activated current transport in MgB_2 films
• Superconducting screening on different length scales in high-quality bulk MgB2 superconductor
• I-V characteristics of the vortex state in MgB2 thin films
• Magnetization relaxation, critical current density and vortex dynamics in a Ba${}_{0.66}$K${}_{0.32}$BiO${}_{3+\delta }$ single crystal
• Vortex dynamics and second magnetization peak in PrFeAsO${}_{0.60}$F${}_{0.12}$ superconductor