caa a22 4500 445382104 CHVBK 20180317143020.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0978-3 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0978-3 Doping Dependent Quasiparticle Relaxation Dynamics inSmFeAsO1− x F x Single Crystals: Comparison ofSpin-Density Wave and Superconducting States [Elektronische Daten] [T. Mertelj, P. Kusar, L. Stojchevska, V. Kabanov, N. Zhigadlo, S. Katrych, J. Karpinski, D. Mihailovic] We use optical femtosecond spectroscopy to investigate the quasiparticle relaxation and low-energy electronic structure in undoped and near-optimally doped SmFeAsO1−x Fx iron-pnictide superconductor single crystals (SC). In the undoped SC, a single relaxation process with a divergent-like relaxation time at the spin density wave (SDW) transition is observed. From the relaxation time in the normal state, significantly above T SDW, the second moment of the Eliashberg function is determined to be λ〈ω 2〉≈135meV2. Below T SDW, the temperature dependence of the photoexcited reflectivity transients indicates the appearance of a bottleneck due to opening of a SDW gap with a BCS-like temperature dependence and the characteristic magnitude, 2ΔSDW/k B T SDW=7±3, at4.2K. In the superconducting SC, multiple relaxation processes are present. In addition to the relaxation processes observed in the normal state, a distinct superconducting state relaxation component is observed consistent with the presence of BCS T-dependent gaps. Springer Science+Business Media, LLC, 2010 Optical femtosecond spectroscopy nationallicence Iron-pnictide superconductors nationallicence Spin density wave nationallicence Electron-phonon coupling nationallicence Mertelj T. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut Kusar P. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut Stojchevska L. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut Kabanov V. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut Zhigadlo N. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland aut Katrych S. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland aut Karpinski J. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland aut Mihailovic D. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 489-493 1557-1939 24:1-2<489 2011 24 10948 https://doi.org/10.1007/s10948-010-0978-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0978-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mertelj T. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Kusar P. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Stojchevska L. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Kabanov V. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Zhigadlo N. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland aut NATIONALLICENCE 700 1- Katrych S. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland aut NATIONALLICENCE 700 1- Karpinski J. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland aut NATIONALLICENCE 700 1- Mihailovic D. Complex Matter Dept., Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 489-493 1557-1939 24:1-2<489 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer