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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics

TT 66.2: Talk

Thursday, March 21, 2024, 09:45–10:00, H 3005

Observation of zero-energy modes in Gd atomic chains on superconducting Nb(110) — •Yu Wang — Physikalisches Institut, Experimentelle Physik II, Universitaet Wuerzburg, Am Hubland, D-97074 Würzburg, Germany

The proposal to generate topologically protected edge states by linking Yu-Shiba-Rusinov states within a 1D chain of magnetic adsorbates has sparked considerable interest to the study of YSR states. Numerous research studies have been conducted on 3d transition metals placed on various superconducting substrates. In contrast, experimental results for 4f -shell rare-earth metals are scarce. However, rare-earth metals such as Gd, Tb, Dy, on superconductors are highly intriguing owing to highly localized strong magnetic moment of the 4f orbital which is primarily screened by outer electronic shells. In this experimental study, we investigate Yu-Shiba-Rusinov states induced by Gd adatoms on a superconducting Nb(110) surface. We are able to engineer Gd atom chains along the substrate’s [110] and [001] directions, revealing distinct behaviors in differently oriented chains. [110]-oriented Gd chains exhibit spectroscopic features at their ends, identifying them as trivial edge states, while [001]-oriented Gd chains display zero-energy edge states, suggesting non-trivial nature.