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Photoinduced Quasiparticle Relaxation Dynamics in Near-optimally Doped SmFeAsO0.8F0.2 Single Crystals

  • T. Mertelj
  • V. V. Kabanov
  • C. Gadermaier
  • N. D. Zhigadlo
  • S. Katrych
  • Z. Bukowski
  • J. Karpinski
  • D. Mihailovic
Original Paper

Abstract

We investigate the quasiparticle relaxation and low-energy electronic structure in a near-optimally doped pnictide superconductor with T c=49.5 K by means of femtosecond spectroscopy. Multiple relaxation processes are evident, with distinct superconducting state dynamics and a clear “pseudogap”-like feature with an onset above 180 K indicating the existence of a temperature-independent gap of magnitude Δ PG=61±9 meV above and below T c. The fluence and temperature dependence of the superconducting state dynamics shows similar behaviour to the cuprate superconductors with the superconducting-condensate vaporization energy of E va/k B≈1.5 K per Fe ion.

Keywords

Superconductivity Time-resolved optical spectroscopy Pseudogap Iron-based pnictides Quasiparticle relaxation 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • T. Mertelj
    • 1
  • V. V. Kabanov
    • 1
  • C. Gadermaier
    • 1
  • N. D. Zhigadlo
    • 2
  • S. Katrych
    • 2
  • Z. Bukowski
    • 2
  • J. Karpinski
    • 2
  • D. Mihailovic
    • 1
  1. 1.Complex Matter DepartmentJozef Stefan InstituteLjubljanaSlovenia
  2. 2.Laboratory for Solid State PhysicsETH ZürichZürichSwitzerland

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