Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba0.6K0.4Fe2As2 Superconductor Revealed by Pump-Probe Spectroscopy
Darius H. Torchinsky, G. F. Chen, J. L. Luo, N. L. Wang, Nuh Gedik
DOI 10.1103/PhysRevLett.105.027005 · Physical Review Letters
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Abstract
We report on band-dependent quasiparticle dynamics in Ba0.6K0.4Fe2As2 (Tc=37 K) measured using ultrafast pump-probe spectroscopy. In the superconducting state, we observe two distinct relaxation processes: a fast component whose decay rate increases linearly with excitation density and a slow component with an excitation density independent decay rate. We argue that these two components reflect the recombination of quasiparticles in the two hole bands through intraband and interband processes. We also find that the thermal recombination rate of quasiparticles increases quadratically with temperature. The temperature and excitation density dependence of the decays indicates fully gapped hole bands and nodal or very anisotropic electron bands.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | onset |
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