Anomalous flux flow resistivity in the two-gap superconductor MgB2
A. Shibata, M. Matsumoto, K. Izawa, Y. Matsuda, S. Lee, S. Tajima
DOI 10.1103/PhysRevB.68.060501 · Physical Review B
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Abstract
The flux flow resistivity ρf associated with purely viscous motion of vortices in high-quality MgB2 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 ρf slopes was clearly observed in H‖ab plane. The unusual H dependence indicates that two very differently sized superconducting gaps in MgB2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.6 | Pressure not reported | unknown |
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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