Distinct Pseudogap and Quasiparticle Relaxation Dynamics in the Superconducting State of Nearly Optimally Doped SmFeAsO0.8F0.2 Single Crystals
T. Mertelj, V. V. Kabanov, C. Gadermaier, N. D. Zhigadlo, S. Katrych, J. Karpinski, D. Mihailovic
DOI 10.1103/PhysRevLett.102.117002 · Physical Review Letters
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Abstract
We use femtosecond spectroscopy to investigate the quasiparticle relaxation and low-energy electronic structure in a nearly optimally doped pnictide superconductor with Tc=49.5 K. Multiple relaxation processes are evident, with distinct superconducting state quasiparticle recombination dynamics exhibiting a T-dependent superconducting gap, and a clear “pseudogaplike” feature with an onset above 180 K indicating the existence of a temperature-independent gap of magnitude ΔPG=61±9 meV above Tc. Both the superconducting and pseudogap components show saturation as a function of fluence with distinct saturation fluences 4 and 40 μJ/cm2, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 49.5 | Pressure not reported | unknown |
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