Reorientation of the diagonal double-stripe spin structure at Fe1+yTe bulk and thin-film surfaces

Torben Hänke (), Udai Raj Singh, Lasse Cornils, Sujit Manna, Anand Kamlapure, Martin Bremholm, Ellen Marie Jensen Hedegaard, Bo Brummerstedt Iversen, Philip Hofmann, Jin Hu, Zhiqiang Mao, Jens Wiebe () and Roland Wiesendanger
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Torben Hänke: Hamburg University
Udai Raj Singh: Hamburg University
Lasse Cornils: Hamburg University
Sujit Manna: Hamburg University
Anand Kamlapure: Hamburg University
Martin Bremholm: Center for Materials Crystallography, Aarhus University
Ellen Marie Jensen Hedegaard: Center for Materials Crystallography, Aarhus University
Bo Brummerstedt Iversen: Center for Materials Crystallography, Aarhus University
Philip Hofmann: Interdisciplinary Nanoscience Center, Aarhus University
Jin Hu: Tulane University
Zhiqiang Mao: Tulane University
Jens Wiebe: Hamburg University
Roland Wiesendanger: Hamburg University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Establishing the relation between ubiquitous antiferromagnetism in the parent compounds of unconventional superconductors and their superconducting phase is important for understanding the complex physics in these materials. Going from bulk systems to thin films additionally affects their phase diagram. For Fe1+yTe, the parent compound of Fe1+ySe1−xTex superconductors, bulk-sensitive neutron diffraction revealed an in-plane oriented diagonal double-stripe antiferromagnetic spin structure. Here we show by spin-resolved scanning tunnelling microscopy that the spin direction at the surfaces of bulk Fe1+yTe and thin films grown on the topological insulator Bi2Te3 is canted out of the high-symmetry directions of the surface unit cell resulting in a perpendicular spin component, keeping the diagonal double-stripe order. As the magnetism of the Fe d-orbitals is intertwined with the superconducting pairing in Fe-based materials, our results imply that the superconducting properties at the surface of the related superconducting compounds might be different from the bulk.

Date: 2017
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DOI: 10.1038/ncomms13939

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