Anomalous Flux Flow Resistivity in Two Gap Superconductor MgB_2

Details Anomalous Flux Flow Resistivity in Two Gap Superconductor MgB_2 Anomalous Flux Flow Resistivity in Two Gap Superconductor MgB_2

2003-06-03

arxiv.org/abs/cond-mat/0306057v1

Physics

Condensed Matter

Superconductivity

4 pages, 3figures

Scientific paper

10.1103/PhysRevB.68.060501

The flux flow resistivity associated with purely viscous motion of vortices in high-quality MgB_2 was measured by microwave surface impedance. Flux flow resistivity exhibits unusual field dependence with strong enhancement at low field, which is markedly different to conventional s-wave superconductors. A crossover field which separates two distinct flux flow regimes having different flux flow resistivity slopes was clearly observed in H//ab-plane. The unusual H-dependence indicates that two very differently sized superconducting gaps in MgB_2 manifest in the vortex dynamics and almost equally contribute to energy dissipation. The carrier scattering rate in two different bands is also discussed with the present results, compared to heat capacity and thermal conductivity results.

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