Gap structure of FeSe
​Highly anisotropic superconducting gap structure of FeSe. In the talk I will explain how such superconducting properties can be explained from superconductivity arising in a Hund's metal.
​Image credit: Science 357, 75 (2017)

General Physics Colloquium by Brian Andersen

Title: New Clues to the Mechanism of Unconventional Superconductivity from Spectroscopy and Theory of Iron-based Superconductors
Talk by Brian Andersen, University of Copenhagen, Denmark


Iron-based superconductors have been extensively studied both experimentally and theoretically over the last decade, with great progress in our understanding of these materials. Recent focus on FeSe has been centered on the connection between nematicity and superconductivity, and the possibility of enhancing Tc in monolayers on STO, or by pressure. In this talk, I will give and overview of recent developments and focus on recent scanning tunneling experiments mapping out the detailed spectroscopic features of FeSe by the group of J. C. Seamus Davis at Cornell University. I will explain the recent evidence for orbital selective superconducting pairing, and the direct detection of orbital selective quasiparticles by quasi-particle interference. This highlights the correlated nature of FeSe, more specifically its Hund’s metal nature with coexisting orbital-dependent coherent and incoherent low-energy states. I then proceed to discuss the theoretical modelling of these phenomena and the implications for our understanding of the origin of superconductivity in FeSe in particular, and in the iron-based superconductors in general.
Category Colloquium
Location: PJ, lecture hall,
Starts: 25 October, 2018, 13:15
Ends: 25 October, 2018, 14:00

Published: Tue 26 Jun 2018. Modified: Wed 03 Oct 2018