Physikalische Chemie - Direktor: Prof. Dr. Martin Wolf
Host: M. Wolf
Friday, September 29, 2017, 11:00 am
All are invited to meet around 10:40 am for a chat with coffee & cookies.
PC Seminar Room, G 2.06, Faradayweg 4
Dr. Moritz Hoesch
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxford, UK
Superconductivity out of Electronic Crystal Phases
Non-conventional superconductivity competes with alternative ordered low temperature phases of materials in many fashions. In this seminar we study the Fermi surfaces and low energy photoelectron spectra of materials that show evidence of order driven from the electronic structure. The experiments are performed at a temperature close to the superconducting transition thus firmly establishing the electronic structure out of which superconductivity arises. In the case of the prototypical iron bases superconductor FeSe we have disentangled the role of the various orbitals of the multi-sheet Fermi surface to the formation of the nematic phase below the phase transition at Ts = 90 K. In the case of structurally quasi-one-dimensional Tl2Mo6Se6 and K2Cr3As3 we present evidence of the formation of a Tomonaga-Luttinger-Liquid (TLL) adjacent to the superconducting phase.