Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 88: Electronic Structure: Surface Magnetism and Spin Phenomena
O 88.10: Talk
Thursday, March 19, 2015, 17:15–17:30, MA 042
State identification and tunable Kondo effect of MnPc — •Andreas Krönlein1, Jens Kügel1, Michael Karolak2, Pin-Jui Hsu1, Jacob Senkpiel1, Giorgio Sangiovanni2, and Matthias Bode1 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Germany — 2Institut für Theoretische Physik und Astronomie, Theoretische Physik I, Universität Würzburg, Germany
In the past the Kondo effect of transition metal phthalocyanine (Pc) molecules has been intensively studied [1].
Recently, by combined scanning tunneling spectroscopy (STS) and density functional theory
we could show that also MnPc/Ag(001) exhibits a Kondo effect [2].
The STS data could, however, not satisfyingly be fit by a single Fano function.
Rather they appear to be a superimposition of the Kondo feature and another, yet unknown contribution.
In this presentation we will show that the tunneling spectrum can be fitted by
either two Fano functions, which would indicate two separate Kondo channels [3],
or by a combination of a Fano and a Gauss function, with the latter representing an orbital state.
We find that spatially resolved Kondo maps are only consistent with the second scenario.
This is corroborated by a systematic investigation that, in addition to MnPc, also includes FePc and CoPc.
In either case progressive dehydrogenation leads to a continuous shift of what is identified as the dz2 molecular orbital.
The influence on the Kondo temperature of MnPc will be discussed.
A. Mugarza et al., Phys. Rev. B 85, 155437 (2012).
J. Kügel et al., Nano Lett. 14, 3895 (2014).
K.J. Franke et al., Science 332, 6032 (2011).