Magnetic field dependence of vortex activation energy: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors
S. D. Kaushik, V. Braccini, S. Patnaik
TL;DR
This study compares the vortex activation energy dependence on magnetic field in MgB2, NbSe2, and Bi2Sr2Ca2Cu3O10 superconductors, revealing distinct field dependence behaviors and flux flow mechanisms.
Contribution
It provides the first comparative analysis of vortex activation energy and flux flow behavior across these three different superconductor classes.
Findings
Thermally activated flux flow observed in MgB2.
MgB2's activation energy field dependence is parabolic.
Bi2Sr2Ca2Cu3O10 shows power law dependence.
Abstract
The dissipative mechanism at low current density is compared in three different classes of superconductors. This is achieved by measurement of resistance as a function of temperature and magnetic field in clean polycrystalline samples of NbSe2, MgB2 and Bi2Sr2Ca2Cu3O10 superconductors. Thermally activated flux flow behavior is clearly identified in bulk MgB2. While the activation energy at low fields for MgB2 is comparable to Bi2Sr2Ca2Cu3O10, its field dependence follows a parabolic behavior unlike a power law dependence seen in Bi2Sr2Ca2Cu3O10. We analyze our results based on the Kramer's scaling for grain boundary pinning in MgB2and NbSe2.
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