Magnetism by embedding 3d transition metal atoms into germanene

Durgesh Kumar Sharma, Sudhir Kumar, Sushil Auluck
2018 Journal of Physics D: Applied Physics  
Magnetic atoms on heavy-element superconducting substrates are potential building blocks for realizing topological superconductivity in one-and two-dimensional atomic arrays. Their localized magnetic moments induce so-called Yu-Shiba-Rusinov (YSR) states inside the energy gap of the substrate. In the dilute limit, where the electronic states of the array atoms are only weakly coupled, proximity of the YSR states to the Fermi energy is essential for the formation of topological superconductivity
more » ... l superconductivity in the band of YSR states. Here, we reveal via scanning tunnel spectroscopy and ab initio calculations of a series of 3d transition metal atoms (Mn, Fe, Co) adsorbed on the heavy-element superconductor Re that the increase of the Kondo coupling and sign change in magnetic anisotropy with d-state filling is accompanied by a shift of the YSR states through the energy gap of the substrate and a crossing of the Fermi level. The uncovered systematic trends enable the identification of the most promising candidates for the realization of topological superconductivity in arrays of similar systems. npj Quantum Materials (2019) 4:42 ; https://doi.
doi:10.1088/1361-6463/aabf2e fatcat:72ooqfvhabee3ovbg7vf4ba5du