Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Superconductivity: Fe-based Superconductors - FeSe and others
TT 59.2: Vortrag
Donnerstag, 23. März 2017, 09:45–10:00, HSZ 103
Temperature evolution of the band structure of FeSe — •Yevhen Kushnirenko1, Alexander Fedorov1, 2, Erik Haubold1, Timur Kim3, Moritz Hoesch3, Thomas Wolf4, Bernd Büchner1, and Sergey Borisenko1 — 1IFW-Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Physikalisches Institut, Universit at zu Köln, Zulpicher Strasse 77, 50937 Köln, Germany — 3Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom — 4Institut für Festkörperphysik, Karlsruhe Institute for Technology, Karlsruhe 76021, Germany
We have studied an evolution of the band structure of FeSe in a wide temperature range using angle-resolved photoemission spectroscopy (ARPES). We investigated the behavior of the hole-like bands in the center of the Brillouin zone and electron-like bands in its corners. We have shown that all these dispersions move with temperature as a function of binding energy. Remarkably, a direction of these shifts is different for the center and the corners of the Brillouin zone. This band structure behavior is observed for the orthorhombic state of FeSe (T<86K) as well as for the tetragonal state (T>86K).