title: Reorientation of the diagonal double-stripe spin structure at Fe1+yTe bulk and thin-film surfaces.
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-xTexsuperconductors, 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 Bi2Te3is 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.
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Torben
authors.initials: T
authors.lastname: Hänke
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Udai Raj
authors.initials: UR
authors.lastname: Singh
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Lasse
authors.initials: L
authors.lastname: Cornils
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Sujit
authors.initials: S
authors.lastname: Manna
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Anand
authors.initials: A
authors.lastname: Kamlapure
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Martin
authors.initials: M
authors.lastname: Bremholm
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Ellen Marie Jensen
authors.initials: EM
authors.lastname: Hedegaard
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Bo Brummerstedt
authors.initials: BB
authors.lastname: Iversen
authors.affiliation: Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Philip
authors.initials: P
authors.lastname: Hofmann
authors.affiliation: Department of Physics and Engineering Physics, Tulane University, New Orleans, Los Angeles 70118, USA.
authors.forename: Jin
authors.identifier: 0000-0003-0080-4239
authors.initials: J
authors.lastname: Hu
authors.affiliation: Department of Physics and Engineering Physics, Tulane University, New Orleans, Los Angeles 70118, USA.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Mao
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Wiebe
authors.affiliation: Department of Physics, Hamburg University, Jungiusstrasse 9A, 20355 Hamburg, Germany.
authors.forename: Roland
authors.initials: R
authors.lastname: Wiesendanger