We use femtosecond spectroscopy to investigate the quasiparticle relaxation and low-energy electronic structure in a nearly optimally doped pnictide superconductor with Tc=49.5K. 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±9meV above Tc. Both the superconducting and pseudogap components show saturation as a function of fluence with distinct saturation fluences 4 and 40μJ/cm2, respectively. © 2009 The American Physical Society.

Distinct pseudogap and quasiparticle relaxation dynamics in the superconducting state of nearly optimally doped SmFeAsO0.8F0.2 single crystals

Gadermaier, C.;
2009-01-01

Abstract

We use femtosecond spectroscopy to investigate the quasiparticle relaxation and low-energy electronic structure in a nearly optimally doped pnictide superconductor with Tc=49.5K. 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±9meV above Tc. Both the superconducting and pseudogap components show saturation as a function of fluence with distinct saturation fluences 4 and 40μJ/cm2, respectively. © 2009 The American Physical Society.
2009
Physics and Astronomy (all)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1122006
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