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Physics Seminar

Exploring nematic electronic phases of superconducting FeSe1-xSx

Speaker: Amalia Coldea (University of Oxford)
Date: Wednesday 8 December 2021
Time: 15:00
Venue: Zoom

Iron-based chalcogenides superconductors offer a unique playground for the exploration of superconductivity emerging from competing electronic phases, such as nematic and spin-density wave phases. In this talk, I will present experimental data on single crystals of superconducting FeSe1-xSx tuned by chemical and applied external pressure. Using angle-resolved photoemission spectroscopy (ARPES) and quantum oscillations we can identify the evolution of Fermi surfaces and quasiparticle effective masses across the nematic phase transition. Follow the quasiparticle effective masses under pressure we determine that the nematic critical fluctuations are quenched and do not play a role in enhancing superconductivity in these systems.

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