Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors - FeSe and LiFeAs
TT 52.6: Talk
Wednesday, March 14, 2018, 10:45–11:00, HFT-FT 101
Domain Imaging Across the Magneto-Structural Phase Transition in Fe1+yTe — •Jonas Warmuth1, Martin Bremholm2, Philip Hofmann2, Jens Wiebe1, and Roland Wiesendanger1 — 1Dept. of Physics, Hamburg University, Germany — 2Depts. of Chemistry and Physics, Aarhus University, Denmark
The investigation of the magnetic phase transitions in the parent compounds of Fe-based superconductors is essential for understanding the pairing mechanism in the related superconducting compounds [1,2]. Here, we present a real space spin-resolved scanning tunneling microscopy investigation of the surface of Fe1+yTe single crystals with different excess Fe contents, y, which are continuously driven through the magnetic phase transition. For Fe1.08Te, the transition into the low-temperature monoclinic commensurate antiferromagnetic phase [3] is accompanied by the sudden emergence of ordering into four rotational domains with different orientations of the monoclinic structure and of the antiferromagnetic order, showing how structural and magnetic order are intertwined. In the low-temperature phase of Fe1.12Te one type of the domain boundaries disappears, and the transition into the paramagnetic phase gets rather broad, which is assigned to the formation of a mixture of orthorhombic and monoclinic phases [4].
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