Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 112: Electronic structure: Surface magnetism and spin phenomena II
O 112.4: Talk
Friday, March 16, 2018, 11:15–11:30, MA 042
Probing magnetic interactions between Cr adatoms on the β-Bi2Pd superconductor — •Deung-Jang Choi1,2,3, Carlos García Fernández3, Edwin Herrera4, Carmen Rubio-Verdú3, Miguel M. Ugeda3, Isabel Guillamón4, Hermann Suderow4, Jose Ignacio Pascual3, and Nicolás Lorente2,3 — 1Centro de Fisica de Materiales, CFM/MPC (CSIC-UPV/EHU), Donostia-San Sebastian, Spain — 2Donostia International Physics Center (DIPC), Donostia-San Sebastian, Spain — 3CIC nanoGUNE, Donostia-San Sebastián, Spain — 4Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Spain
Recently, the introduction of new impurity states in the superconducting gap has received a lot of attention. Indeed, the search of a new superconducting state dubbed topological superconductivity is strongly based in the combination of doping classical (s-wave) superconductors with magnetic impurities that arrange in a chiral fashion. Magnetic adatoms can be considered as impurities that weaken the binding of superconducting Cooper pairs leading to impurity levels in the gap: so-called Yu-Shiba-Rusinov (YSR) states. By using scanning tunneling microscope (STM), we present the first results of controlled single-atom manipulation to assemble a chain of Cr atoms on a Bi2Pd superconductor. The interatomic distance between two Cr atoms is thoroughly explored revealing Cr-Cr interactions mediated by the superconductor for the first time1. ([1] Choi, D.-J. et al. arXiv:1709.09224)