Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors - FeSe and LiFeAs
TT 52.4: Vortrag
Mittwoch, 14. März 2018, 10:15–10:30, HFT-FT 101
Gap anisotropy in FeSe from ARPES — •Yevhen Kushnirenko1, Alexander Fedorov1, Erik Haubold1, Timur Kim2, Thomas Wolf3, Saicharan Aswartham1, Bernd Büchner1, and Sergey Borisenko1 — 1IFW Dresden, 01069 Dresden, Germany — 2Diamond Light Source, Didcot OX11 0DE, United Kingdom — 3Institut für Festkörperphysik, Karlsruhe Institute for Technology, Karlsruhe 76021, Germany
There were plenty of attempts to measure superconducting gap in FeSe and related SC using different techniques: tunneling spectroscopy, photoemission spectroscopy, specific heat. But the consensus on a size and symmetry of the SC gap has not been reached. ARPES is only one technique, in which it is possible to measure SC gap in a certain part of momentum space directly. Because of this ARPES is a key tool for solving this complicated problem. Here we present results of our investigation of the superconducting gap anisotropy in FeSe using angle-resolved photoemission spectroscopy. We have measured the superconducting gap for both electron- and hole-like pockets for different kz positions. The gaps on both pockets are considerably anisotropic. Such gap anisotropy can possibly be explained in terms of orbital-selective pairing.