Time-Resolved Photoexcitation of the Superconducting Two-Gap State in MgB2 Thin Films
Y. Xu, M. Khafizov, L. Satrapinsky, P. Kúš, A. Plecenik, Roman Sobolewski
DOI 10.1103/PhysRevLett.91.197004 · Physical Review Letters
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Abstract
Femtosecond pump-probe studies show that carrier dynamics in MgB2 films is governed by the sub-ps electron-phonon (e-ph) relaxation present at all temperatures, the few-ps e-ph process well pronounced below 70 K, and the sub-ns superconducting relaxation below Tc. The amplitude of the superconducting component versus temperature follows the superposition of the isotropic dirty gap and the three-dimensional π gap dependences, closing at two different Tc values. The time constant of the few-ps relaxation exhibits a double divergence at temperatures corresponding to the Tc’s of the two gaps.
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. | 35 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | onset |
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