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O: Fachverband Oberflächenphysik
O 59: Spins on Surfaces at the Atomic Scale I
O 59.2: Vortrag
Mittwoch, 19. März 2025, 10:45–11:00, H6
Tuning the Kondo temperature of Porphyrin molecules via adsorption configurations. — •Xiangzhi Meng1, Jenny Möller2, Rodrigo Menchón3, Alexander Weismann1, Daniel Sánchez-Portal3, Aran Garcia-Lekue3, Rainer Herges2, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany — 2Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität, 24098 Kiel, Germany — 3Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
Magnetic molecules may serve as building blocks for spintronic devices at the ultimate limit of miniaturization. This sort of application requires an understanding of their spin properties. An important example is the Kondo effect that originates from the exchange interaction between a localized magnetic moment and the conduction electrons of the host metal. The interaction strength is reflected by a characteristic temperature, the Kondo temperature TK. In this work, we will show the Kondo effect of cobalt(II)-5,15-bis(4'-bromophenyl)-10,20-bis(4'-iodophenyl)porphyrin (CoTPPBr2I2) molecules on an Au(111) surface with a low-temperature STM. In comparison with the molecules reported before, the Kondo temperature of CoTPPBr2I2 can be tuned over a much broader range (8 K to 250 K) by switching their configurations. Additionally, we show that surface reconstruction plays a crucial role in modulating the molecular Kondo effect.
Keywords: Kondo effect; Co-porphyrin; spin states; scanning tunneling microscopy