Time-resolved dynamics of the superconducting two-gap state in MgB2 thin films

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 3-dimensional 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.

Accepted for publication in Phys.Rev.Lett

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• Photoinduced time-resolved electrodynamics of superconducting metals and alloys
• Real-time Observation of Phonon-Mediated $\sigma$-$\pi$ Interband Scattering in MgB2
• High-order nonlinear terahertz probing of the two-band superconductor MgB${}_2$: Third- and fifth-order harmonic generation
• A sol-gel method for growing superconducting MgB2 films
• Ultrafast spectroscopy of quasiparticle dynamics in cuprate superconductors
• Microscopic insight on the pump-probe relaxation dynamics of superconductors: Model study of MgB2 relaxation within nonlinear response theory
• Overscreening-free electron-phonon interaction in realistic materials