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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 3: Ultrafast Electron and spin dynamics at interfaces I

O 3.4: Talk

Monday, March 12, 2018, 11:15–11:30, MA 005

Signature of electron-boson coupling in the non-equilibrium electron population of a Fe-based High-Tc superconductor — •Isabella Avigo1, Setti Thirupathaiah1, Manuel Ligges1, Thomas Wolf2, Jörg Fink3, and Uwe Bovensiepen11Universität Duisburg Essen, Fakultät für Physik, 47057 Duisburg, Germany — 2Karlsruhe Institute of Technology, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 3IFW-Dresden, Institute for Solid State Research, 01171 Dresden, Germany

Understanding the origin of microscopic interactions among the various electronic, phononic, magnetic degrees of freedom of complex materials, such as High-Tc superconductors, is an essential problem in modern solid state physics. A promising approach is the study of non-equilibrium states and their relaxation in the time domain, as specific coupling channels leave their characteristic fingerprints on the energy-resolved relaxation of the excited electronic population. We present a time-resolved photoelectron spectroscopy (trARPES) study conducted on a Fe-based High-Tc superconductor, where the energy-dependent relaxation rates of the excited electronic population show a characteristic step-behavior around the energy of 200 meV above the Fermi level, indicating the coupling of the excited electronic system to a bosonic excitation, to which we assign a magnetic origin. Our findings further confirm and generalize our previous results obtained on a Cu-based High-Tc superconductor. We acknowledge funding from the DFG through the priority program SPP1458 and the EU within the seventh Framework Program under Grant No. 280555 (GO FAST).

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