Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 34: Surface and Interface Magnetism II (jointly with O)

MA 34.6: Talk

Thursday, March 14, 2013, 11:45–12:00, H33

Scanning tunneling microscopy and spectroscopy of MnPc on noble metal (111) surfaces — •Jens Kügel, Jeannette Kemmer, Pin-Jui Hsu, and Matthias Bode — Institute of Experimental Physics II, University Würzburg, Germany

The growth, electronic structure, and magnetic excitations of transition metal phthalocyanine (TM-Pc) molecules adsorbed on noble metal fcc(111) substrates have recently attracted considerable interest. While phthalocyanines with a central ion consisting of Fe, Co, Ni, and Cu have already been studied extensively, only few studies deal with MnPc, even though this molecule carries the highest net magnetic moment in the gas phase (S = 3/2) [1]. This property makes it a promising candidate for the observation of collective interaction phenomena with the substrate, such as the Kondo effect. In this contribution we present low-temperature (T = 5 K) scanning tunneling microscopy and spectroscopy data of Mn-Pc adsorbed on Au(111) and Cu(111). The tunneling spectra of Mn-Pc show a distinctly asymmetric conductance around the Fermi level. Our results indicate that this feature critically depends on the chemical state of the tip. By systematically modifying the coupling strength between the molecule and the substrate we will discuss under which conditions the Kondo effect can be observed.

[1] A. Stróżecka et al., Phys. Rev. Lett. 109, 147202 (2012)