Systematic study of Mn atoms, artificial dimers and chains on superconducting Ta(110)

Abstract

Magnetic adatoms coupled to an $s$-wave superconductor give rise to local bound states, so-called Yu-Shiba-Rusinov states. Focusing on the ultimate goal of tailoring chains of such adatoms into a topologically superconducting phase, we investigate basic building blocks - single Fe and Mn adatoms and Mn dimers on clean superconducting Ta(110) - using scanning tunneling microscopy and spectroscopy. We perform a systematic study of the hybridizations and splittings in dimers, and their dependence on the crystallographic directions and interatomic spacings, in order to identify potentially interesting chain geometries for this novel sample type. Subsequently, we study the spin structure as well as the length dependent Shiba band structure in Mn chains of those geometries using spin-resolved scanning tunneling spectroscopy. All results are compared to the according properties of structurally identical dimers and chains on the previously studied Nb(110), which has almost identical surface structure and electronic properties, but an about three times smaller spin-orbit interaction.

arXiv comment14 pages, 10 figures

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Cited by in corpus (6)

• Testing the topological nature of end states in antiferromagnetic atomic chains on superconductors
• Majorana quasiparticles in atomic spin chains on superconductors
• Topological superconductivity in Fibonacci quasicrystals
• Wave-function engineering on superconducting substrates: Chiral Yu-Shiba-Rusinov molecules
• Controlling Majorana hybridization in magnetic chain-superconductor systems
• Bridging Quantum and Classical Descriptions of Spin Dynamics in a Dzyaloshinsky-Moriya Trimer