Distinct pseudogap and superconducting state quasiparticle relaxation dynamics in near-optimally doped SmFeAsO0.8F0.2 single crystals

T. Mertelj; V. V. Kabanov; C. Gadermaier; J. Karpinski; D. Mihailovic

Distinct pseudogap and superconducting state quasiparticle relaxation dynamics in near-optimally doped SmFeAsO0.8F0.2 single crystals

Superconductivity 2008-10-06 v2

Authors: T. Mertelj , V. V. Kabanov , C. Gadermaier , J. Karpinski , D. Mihailovic

Abstract

We use femtosecond spectroscopy to investigate the quasiparticle relaxation and low-energy electronic structure in a near-optimally doped pnictide superconductor with T_c=49.5 K. Multiple relaxation processes are evident, with distinct superconducting state quasiparticle (QP) recombination dynamics exhibiting a T-dependent superconducting (SC) gap, and a clear "pseudogap" (PG) -like feature with an onset around 200K indicating the existence of a temperature-independent gap of magnitude \Delta_PG= 61 +- 9 meV above T_c. Both the SC and PG components show saturation as a function of fluence with distinct saturation thresholds ~0.15 \muJ/cm^2 and 1.5 \muJ/cm^2, respectively.

Keywords

pseudogap superconducting state quasiparticle relaxation pnictide superconductor femtosecond spectroscopy SmFeAsO0.8F0.2

Cite

@article{arxiv.0808.2772,
  title  = {Distinct pseudogap and superconducting state quasiparticle relaxation dynamics in near-optimally doped SmFeAsO0.8F0.2 single crystals},
  author = {T. Mertelj and V. V. Kabanov and C. Gadermaier and J. Karpinski and D. Mihailovic},
  journal= {arXiv preprint arXiv:0808.2772},
  year   = {2008}
}

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