Quantum properties of low-dimensional hybrid spin networks at surfaces

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05326
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 29020:Thin film/surface and interfacial physical properties-related
• Research Institution: Kyoto University
• Principal Investigator: Takagi Noriaki 京都大学, 人間・環境学研究科, 教授 (50252416)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 表面 / ナノサイエンス / 走査トンネル顕微鏡 / 走査トンネル分光

Outline of Final Research Achievements

The structures and the electronic structures of magnetic species and their network formed at surfaces were investigated mainly by scanning tunneling microscopy (STM). Important findings are as follows: For the adsorption of iron phthalocyanine molecules on Ag(111), (110) and (100) surfaces, interesting superstructures were observed for the bilayer. On the (110) surface, one-dimensional clusters were formed, which were arranged into two-dimensional array. On the (100) surface, square clusters were formed and the clusters made a network like checkerboard. Inside the clusters, each molecule showed site-specific tunneling spectrum. For the adsorption of manganese phthalocyanine on superconducting In bilayer on Si(111), spectral evolution was observed. At low coverages, Yu-Shiba-Rusinov state appeared, which evolved to anti ferromagnetic Kondo lattice state in the high coverage where the molecule formed a superstructure.

Free Research Field

表面科学

Academic Significance and Societal Importance of the Research Achievements

表面に吸着した分子系では、自己組織的に超構造が見られる。2層目で基板の面方位によって異なる超構造が観測されたことは、学術的に興味深い。磁性分子による反強磁性近藤格子の形成は珍しく、その機構解明は、広く強相関電子系の学術的発展につながるものと期待される。