Chemistry

Enhanced magnetic spin-spin interactions observed between porphyrazine derivatives on Au(111)

J. Hou, Y. Wang, et al.

Discover the intriguing spin behavior of vanadyl tetrakis(thiadiazole) porphyrazine (VOTTDPz) molecules on Au(111), as revealed by Jie Hou, Yu Wang, Keitaro Eguchi, Chihiro Nanjo, Tsuyoshi Takaoka, Yasuyuki Sainoo, Ryuichi Arafune, Kunio Awaga, and Tadahiro Komeda. This research uncovers how molecular arrangements influence Kondo resonance through complex spin interactions, leading to both ferromagnetic and antiferromagnetic couplings.

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Abstract

This study investigates the novel spin behavior of vanadyl tetrakis(thiadiazole) porphyrazine (VOTTDPz) molecules adsorbed on Au(111). By replacing the inert phthalocyanine ligand with a reactive thiadiazole moiety, the molecule-molecule interaction is enhanced. Scanning tunneling spectroscopy (STS) reveals Kondo resonance features, showing site-dependent variations in shape and intensity, indicating complex spin-spin interactions. Two distinct molecular arrangements (phases I and II) are observed, with phase II exhibiting alternating VO-up and VO-down molecules leading to ferromagnetic (FM) and antiferromagnetic (AFM) couplings, influencing the Kondo resonance.

Publisher

Communications Chemistry

Published On

Mar 20, 2020

Authors

Jie Hou, Yu Wang, Keitaro Eguchi, Chihiro Nanjo, Tsuyoshi Takaoka, Yasuyuki Sainoo, Ryuichi Arafune, Kunio Awaga, Tadahiro Komeda

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