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TT: Fachverband Tiefe Temperaturen

TT 91: 2D Materials VII: Heterostructures (joint session O/TT)

TT 91.5: Talk

Friday, March 22, 2024, 11:30–11:45, MA 005

Electronic Characterization of Magnetic CrCl₃ Monolayers on NbSe₂ — •Jan Cuperus, Anna Reinhold, Daniel Vanmaekelbergh, and Ingmar Swart — Debye Institute for Nanomaterials Science, Utrecht University, The Netherlands

Electronic devices today suffer from a considerable loss of energy in the form of heat. With the ever increasing scale of information processing, it is essential to develop devices that are more efficient either in power usage or in information processing. In both cases, new materials are required to enable this. Van der Waals heterostructures are a class of materials that are well suited to offer the required properties. By combining materials with different properties in a heterostructure with a high quality interface, a plethora of properties can be obtained. Recently, this strategy was used to obtain topological superconductivity by combining superconducting NbSe₂ with ferromagnetic CrBr₃ [1].

We have conducted STM experiments on a similar heterostructure, replacing the out-of-plane ferromagnetism of CrBr3 by the in-plane ferromagnetism of CrCl₃. We present the MBE growth of CrCl₃ on NbSe₂ and structural insight into the formed heterostructure by STM measurements. In addition, the electronic structure is investigated using differential conductance measurements, both with and without an externally applied magnetic field. We show that the superconductivity of NbSe₂ couples to the in-plane ferromagnet, thereby introducing in-gap states.

[1] S. Kezilebieke, et al. Nature 588, 424-428 (2020).

Keywords: Superconductivity; Magnetism; Scanning Tunneling Microscopy (STM); NbSe2