Emergence of Exotic Spin Texture in Supramolecular Metal Complexes on a 2D Superconductor

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Abstract
Designer heterostructures have offered a very powerful strategy to create exotic superconducting states by combining magnetism and superconductivity. In this Letter, we use a heterostructure platform combining supramolecular metal complexes (SMCs) with a quasi-2D van der Waals superconductor NbSe_{2}. Our scanning tunneling microscopy measurements demonstrate the emergence of Yu-Shiba-Rusinov bands arising from the interaction between the SMC magnetism and the NbSe_{2} superconductivity. Using x-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements, we show the presence of antiferromagnetic coupling between the SMC units. These result in the emergence of an unconventional 3×3 reconstruction in the magnetic ground state that is directly reflected in real space modulation of the Yu-Shiba-Rusinov bands. The combination of flexible molecular building blocks, frustrated magnetic textures, and superconductivity in heterostructures establishes a fertile starting point to fabricating tunable quantum materials, including unconventional superconductors and quantum spin liquids.
Funding Information
  • Research Council of Finland (318995, 320555, 331342, 336243, 338478, 346654)
  • H2020 European Research Council (ERC-2017-AdG, 788185)
  • Natural Science Foundation of Jiangsu Province (BK20230474)
  • Suzhou Key Laboratory of Functional Nano and Soft Materials
  • Collaborative Innovation Center of Suzhou Nano Science and Technology
  • Higher Education Discipline Innovation Project
  • China Scholarship Council
  • Ministry of Education, Culture, Sports, Science and Technology
  • Institute for Basic Science (IBS-R027-D1)
  • H2020 Marie Sklodowska-Curie Actions (101064332)
  • Agence Nationale de la Recherche (ANR-05-NANO-073)
  • Jiangsu Specially-Appointed Professors Program
  • Suzhou Key Laboratory of Surface and Interface Intelligent Matter (SZS2022011)
  • Gusu Innovation and Entrepreneurship Talent Program—Major Innovation Team (ZXD2023002)
  • World Premier International Research Center Initiative

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