Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Superconductivity: Fe-based Superconductors - FeSe

TT 46.9: Vortrag

Mittwoch, 9. März 2016, 12:30–12:45, H19

Gap anisotropy in FeSe — •Yevhen Kushnirenko¹, Alexandr Fedorov^1,2, Erik Haubold¹, Bernd Büchner¹, Daniil Evtushinsky³, Timur Kim⁴, Moritz Hoesch⁴, Thomas Wolf⁵, and Sergey Borisenko¹ — ¹IFW-Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — ²Physikalisches Institut, Universit at zu Köln, Zulpicher Strasse 77, 50937 Köln, Germany — ³Helmholtz-Zentrum Berlin, BESSY, D-12489 Berlin, Germany — ⁴Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom — ⁵Institut für Festkörperphysik, Karlsruhe Institute for Technology, Karlsruhe 76021, Germany

FeSe is the simplest iron-based superconductor, but details of its electronic structure such as symmetry and structure of the order parameter are still not known. Knowledge of the superconducting gap symmetry can help us to understand mechanism of pairing in this material. We used angle-resolved photoemission spectroscopy (ARPES) for measurements of the superconducting gap. Synchrotron radiation was used as a light source for our experiments. We analyzed a gap behavior in different parts of the three-dimensional Brillouin zone (near Gamma, Z, A and M-point). We have found considerable gap anisotropy on the electron pocket (near A and M-point). The gap anisotropy on the central pocket (near Z-point) is small. Our results put constraints on existing theories of superconductivity in iron-based pnictides and chalcogenides.