Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies V

O 52.5: Vortrag

Mittwoch, 20. März 2024, 16:15–16:30, MA 004

Accurate Kondo temperature determination of spin-1/2 magnetic impurities — Elia Turco¹, Markus Aapro², Somesh C. Ganguli², •Nils Krane¹, Robert Drost², Nahual Sobrino³, Annika Bernhardt⁴, Michal Juríček⁴, Roman Fasel^1,5, Pascal Ruffieux¹, Peter Liljeroth², and David Jacob^3,6 — ¹Empa, Dübendorf, Switzerland — ²Aalto University, Aalto, Finland — ³Universidad del País Vasco UPV/EHU, San Sebastián, Spain — ⁴University of Zurich, Zurich, Switzerland — ⁵University of Bern, Bern, Switzerland — ⁶IKERBASQUE, Bilbao, Spain

A localized spin interacting with the electron bath of a metallic surface might give rise to the Kondo effect. The energy scale of this interaction is related to the Kondo temperature T_K and an important quantity when it comes to application of nanoscale magnets. In scanning tunneling spectroscopy (STS) the Kondo effect is observed as a resonance at zero bias. The characteristic temperature evolution of this resonance can be used to prove the Kondo nature of the zero-bias resonance, but only when all other significant broadening methods have been taken properly into account. Using Phenalenyl on Au(111) as an ideal spin-1/2 Kondo system, we demonstrate that the lineshape of a Kondo resonance, measured by STS at finite temperatures, can be described very well by a Hurwitz ζ-function. The extracted intrinsic Kondo linewidth fit very well with a recently derived expression for the temperature evolution of the Kondo resonance. Utilizing the new methodology, we are able to extract the Kondo temperature T_K of a system reliably by a single spectra taken at finite temperature.

Keywords: Kondo; Phenalenyl; Carbon magnetism; STS; STM