Magnetic field dependence of vortex activation energy: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors
arXiv:0803.2078 · doi:10.1007/s12043-008-0187-9
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.
References in corpus (9)
- Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering
- Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe
- Electromagnetic, atomic-structure and chemistry changes induced by Ca-doping of low-angle grain boundaries
- Peak effect in single crystal MgB superconductor for -axis
- Significant enhancement of irreversibility field in clean-limit bulk MgB2
- Disorder-induced Phase Transition of Vortex Matter in MgB2
- Thermally-activated current transport in MgB_2 films
- Origin of superconductivity transition broadening in MgB2
- Dependence of the flux creep activation energy on current density and magnetic field for MgB2 superconductor
Cited by in corpus (4)
- Temperature and field dependence of thermally activated flux flow resistance in Bi2Sr2CaCu2O8+δ superconductor
- Temperature-dependent transformation of the magnetic excitation spectrum on approaching superconductivity in Fe1-x (Ni/Cu)x Te0.5 Se0.5
- Study of NbRe non-centrosymmetric superconductor in the normal and superconducting states
- Vortex Lattice Melting of a NbSe2 single grain probed by Ultrasensitive Cantilever Magnetometry