Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 30: Poster Session - Surface Magnetism

O 30.10: Poster

Monday, March 16, 2020, 18:15–20:00, P1A

Kondo Resonance of NO on Au(110)–(1×2) — •Hiroyuki Koshida, Hiroshi Okuyama, Shinichiro Hatta, and Tetsuya Aruga — Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

Nitric oxide (NO) is a diatomic molecule that has a localized spin due to its unpaired electron in a 2π^∗ state. We studied the interaction of NO with Au(110)–(1×2) using STM/STS, and observed Kondo resonance states originated from the survived spin of NO.

We found three types of NO adsorbed states on the surface: two kinds of NO monomer (denoted as A and B), and a NO trimer. Monomer (B) could be produced from monomer (A) by applying a voltage pulse (∼±300 mV) onto the monomer (A). By conducting STS (dI/dV) measurements using a lock-in amplifier at 4.5 K, we observed dip and peak structures at 0 mV for monomer (B) and the trimer, respectively, whereas no structure was observed for monomer (A). From the temperature-dependent measurements, the dip and peak structures were attributed to Kondo resonance states. Besides, we observed sidebands at ±5 meV and ±36 meV for the trimer, which stemmed from the coupling of Kondo resonance with molecular vibrations. This study demonstrates the strong dependence of the Kondo resonance states of NO, i.e., the magnetic properties of the molecule, on the adsorbed states.