Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Organic Molecules on Inorganic Substrates III: Magnetism, Doping and Interfaces
O 54.1: Vortrag
Mittwoch, 3. April 2019, 10:30–10:45, H24
Jahn-Teller Splitting in Single Adsorbed Molecules Revealed by Isospin-Flip Excitations — •M. Böhme1, J. Kügel1, P.-J. Hsu1, K. Schneider1, J. Senkpiel1, D. Serrate2, M. Bode1, and N. Lorente3 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Germany — 2Instituto de Nanociencia de Aragon & Departamento Fisica Materia Condensada, University of Zaragoza, Spain — 3Centro de Fisica de Materiales & Donostia International Physics Center, San Sebastian, Spain
In the past decades, the spin Kondo effect was subject of numerous studies [1]. Its hallmark is a resonance at the Fermi level which emerges from the screening of a spin-degenerate localized orbital and splits in an external magnetic field and leads to inelastic spin-flip excitations. In this study, we report on the observation of an unusual spatial variation of the inelastic STS signal observed on single MnPc molecules adsorbed on (√3 × √3) surface alloys of post-transition metals with noble metal fcc(111) surfaces. On these distorted molecules we measure tunneling spectra which are characterized by abrupt rises of the conductance at either positive or negative bias polarity depending on the tip position. The results are interpreted in terms of a Jahn-Teller effect which lifts the orbital degeneracy and leads to an isospin- or pseudospin-flip excitation, the inelastic analogue of an orbital Kondo resonance [2].
[1] M. Ternes et. al., J. Phys. Condens. Matter 21, 053001 (2009).
[2] J. Kügel et. al., Phys. Rev. Lett. 21, 226402 (2018).