Journal
PHYSICAL REVIEW LETTERS
Volume 91, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.91.197004
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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 T-c. The amplitude of the superconducting component versus temperature follows the superposition of the isotropic dirty gap and the three-dimensional pi gap dependences, closing at two different T-c values. The time constant of the few-ps relaxation exhibits a double divergence at temperatures corresponding to the T-c's of the two gaps.
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