Spatially extended underscreened Kondo state from collective molecular spin

Emi Minamitani, Ying-Shuang Fu, Qi-Kun Xue, Yousoo Kim, and Satoshi Watanabe
Phys. Rev. B 92, 075144 – Published 31 August 2015
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Abstract

The magnetic state and the Kondo effect in Mn phthalocyanine (MnPc) molecules on Pb(111) were investigated using low-temperature scanning tunneling microscopy (STM), density-functional theory, and numerical renormalization group calculations. We found that a unique spin state induced by the strong πd interaction between the Mn d-orbitals and ligand π-orbitals causes an underscreened Kondo effect observed both at Mn and the ligand. STM observations show that a Kondo resonance extends over the pyrrole ring in the Pc ligand rather than remaining localized at Mn. In gas-phase MnPc, we reveal that the πd interaction result in an S=3/2 collective spin state extended over the Pc ligand with a complex spin polarization inside the molecule. On Pb(111), charge transfer from the substrate reduces the total spin of MnPc from 3/2 to 1 while the intramolecular πd interaction is maintained. Partial screening of this collective S=1 spin state by the conduction electron in Pb(111) makes the Kondo resonance also observed at the ligand part, which is not directly hybridized with the substrate.

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  • Received 22 January 2015

DOI:https://doi.org/10.1103/PhysRevB.92.075144

©2015 American Physical Society

Authors & Affiliations

Emi Minamitani1,*, Ying-Shuang Fu2, Qi-Kun Xue3, Yousoo Kim4, and Satoshi Watanabe1

  • 1Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
  • 2School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
  • 3Department of Physics, Tsinghua University, Beijing 100084, China
  • 4Surface and Interface Science Laboratory, RIKEN, Saitama 351-0198, Japan

  • *Corresponding author: eminamitani@cello.t.u-tokyo.ac.jp

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Issue

Vol. 92, Iss. 7 — 15 August 2015

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