title: Magnetic Properties of Restacked 2D Spin 1/2 honeycomb RuCl3 Nanosheets.
abstract: Spin 1/2 honeycomb materials have gained substantial interest due to their exotic magnetism and possible application in quantum computing. However, in all current materials out-of-plane interactions are interfering with the in-plane order, hence a true 2D magnetic honeycomb system is still in demand. Here, we report the exfoliation of the magnetic semiconductor α-RuCl3 into the first halide monolayers and the magnetic characterization of the spin 1/2 honeycomb arrangement of turbostratically stacked RuCl3 monolayers. The exfoliation is based on a reductive lithiation/hydration approach, which gives rise to a loss of cooperative magnetism due to the disruption of the spin 1/2 state by electron injection into the layers. The restacked, macroscopic pellets of RuCl3 layers lack symmetry along the stacking direction. After an oxidative treatment, cooperative magnetism similar to the bulk is restored. The oxidized pellets of restacked single layers feature a magnetic transition at TN = 7 K if the field is aligned parallel to the ab-plane, while the magnetic properties differ from bulk α-RuCl3 if the field is aligned perpendicular to the ab-plane. The deliberate introduction of turbostratic disorder to manipulate the magnetic properties of RuCl3 is of interest for research in frustrated magnetism and complex magnetic order as predicted by the Kitaev-Heisenberg model.
authors.affiliation: Max Planck Institute for Solid State Research , Heisenbergstrasse 1, 70569 Stuttgart, Germany.|Ludwig-Maximilians-Universität , Butenandtstrasse 5-13, 81377 Munich, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Weber
authors.affiliation: Max Planck Institute for Solid State Research , Heisenbergstrasse 1, 70569 Stuttgart, Germany.
authors.forename: Leslie M
authors.initials: LM
authors.lastname: Schoop
authors.affiliation: Max Planck Institute for Solid State Research , Heisenbergstrasse 1, 70569 Stuttgart, Germany.
authors.forename: Viola
authors.initials: V
authors.lastname: Duppel
authors.affiliation: Max Planck Institute for Solid State Research , Heisenbergstrasse 1, 70569 Stuttgart, Germany.|Ludwig-Maximilians-Universität , Butenandtstrasse 5-13, 81377 Munich, Germany.
authors.forename: Judith M
authors.initials: JM
authors.lastname: Lippmann
authors.affiliation: Max Planck Institute for Solid State Research , Heisenbergstrasse 1, 70569 Stuttgart, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Nuss
authors.affiliation: Max Planck Institute for Solid State Research , Heisenbergstrasse 1, 70569 Stuttgart, Germany.|Ludwig-Maximilians-Universität , Butenandtstrasse 5-13, 81377 Munich, Germany.|Nanosystems Initiative Munich and Center for Nanoscience (CeNS) , Schellingstrasse 4, 80799 Munich, Germany.
authors.forename: Bettina V
authors.initials: BV
authors.lastname: Lotsch
keywords: RuCl3; Spin 1/2 honeycomb; exfoliation; frustrated magnetism; monolayer