Dresden 2020 – wissenschaftliches Programm
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TT 16.9: Poster
Montag, 16. März 2020, 15:00–19:00, P2/EG
Pump–probe spectroscopy of iron pnictides under high pressures — •Ivan Fotev1,2, Harald Schneider1, Manfred Helm1,2, Bernd Büchner2,3, Saicharan Aswartham3, and Alexej Pashkin1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2TU Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research, Dresden, Germany
Iron pnictides are very susceptible to external pressure and can become superconducting (SC) at several GPa. Their rich temperature-pressure phase diagram contains a spin-density wave (SDW) phase next to the superconducting dome. Furthermore, it is thought that in iron pnictides the SDW and SC phases may even coexist, and they exhibit a quantum phase transition close to absolute zero.
We investigate the ultrafast quasiparticle dynamics of parental iron pnictides, like BaFe2As2, at low temperatures and high pressures, by combining optical pump–probe spectroscopy with a diamond anvil cell. This approach potentially enables us to identify SDW, SC or metallic state through their characteristic quasiparticle lifetimes and, therefore, scan the phase diagram of the material and explore the coexistence/competition between of SDW and SC phases.