# Frustration-Induced Many-Body Degeneracy in Spin −1/2 Molecular Quantum Rings

https://mdr.nims.go.jp/datasets/5e12d41e-017d-46ed-af4b-ccd45945d910

## File

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## Id

5e12d41e-017d-46ed-af4b-ccd45945d910

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-12T00:50:39.140034Z

## Updated at

2025-08-19T23:30:20.838335Z

## Published at

2025-08-19T23:24:23.829503Z

## Doi



## First published url

https://doi.org/10.1021/jacs.5c03112

## Date published

2025-07-30

## Recorded date published

2025-7-30

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Frustration-Induced Many-Body Degeneracy in Spin −1/2 Molecular Quantum Rings
  title_type: original
  lang: en

## Description

- description: Frustrated spin systems, where competing interactions prevent conventional
    magnetic ordering, provide a platform for uncovering emergent quantum phases and
    exotic many-body phenomena. Particularly, low-dimensional and symmetric geometries
    without boundary conditions allow us to study the unconventional spin states.
    Here, we present S = 1/2 anti-ferromagnetic Heisenberg cyclic pentamer and hexamer
    via homocoupling of air-stable phenalenyl derivatives on Au(111). With a combination
    of scanning tunnelling microscopy/scanning tunnelling spectroscopy at 4.3 K and
    compre-hensive theoretical simulations, we found that while large magnetic exchange
    interactions exist in both rings, the pen-tamer features an increased geometric
    frustration of the system. This frustration induces rotational symmetry in the
    spin wavefunction, leading to a four-fold degenerate ground states of the pentamer.
    The interplay between molecular geometry and magnetic interactions creates the
    unique quantum spin environment. Our findings offer a powerful approach for constructing
    spin-frustrated molecular architectures, allowing precise control over quantum
    magnetic interactions.
  description_type: abstract
  lang: und

## Creator

- name: Donglin Li
  role: author
- name: Nan Cao
  role: author
- name: Marvin Metzelaars
  role: author
  orcid: https://orcid.org/0000-0002-3529-557X
- name: Orlando J. Silveira
  role: author
  orcid: https://orcid.org/0000-0002-0403-9485
- name: Joakim Jestilä
  role: author
  orcid: https://orcid.org/0000-0002-7233-2093
- name: Adolfo Fumega
  role: author
  orcid: https://orcid.org/0000-0002-3385-6409
- name: Tomohiko Nishiuchi
  role: author
  orcid: https://orcid.org/0000-0002-2113-0731
- name: Jose Lado
  role: author
  orcid: https://orcid.org/0000-0002-9916-1589
- name: Adam S. Foster
  role: author
  orcid: https://orcid.org/0000-0001-5371-5905
- name: Takashi Kubo
  role: author
  orcid: https://orcid.org/0000-0001-6809-7396
- name: Shigeki Kawai
  role: author
  orcid: https://orcid.org/0000-0003-2128-0120

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: scanning tunneling microscopy
  schema: not_defined
- subject: quantum spin
  schema: not_defined
- subject: spin-frustrated molecular
  schema: not_defined
- subject: " quantum magnetic interactions"
  schema: not_defined
- subject: scanning tunneling spectroscopy
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Journal of the American Chemical Society
  issn: '00027863'
  volume: '147'
  issue: '30'
  start_page: 26208
  end_page: 26217

## Conference



## Related item



## Funding

- identifier: 25H00422
  funder_name: Japan Society for the Promotion of Science
- identifier: '346824'
  funder_name: Research Council of Finland
- identifier: '347319'
  funder_name: Research Council of Finland
- identifier: '35808'
  funder_name: Research Council of Finland
- identifier: 20H05865
  funder_name: Japan Society for the Promotion of Science
- identifier: 22H00285
  funder_name: Japan Society for the Promotion of Science
- identifier: 24H00459
  funder_name: Japan Society for the Promotion of Science
- identifier: 24K21721
  funder_name: Japan Society for the Promotion of Science
- identifier: 24KF0269
  funder_name: Japan Society for the Promotion of Science
- identifier: '331342'
  funder_name: Research Council of Finland

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Thumbnail

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filename: 20250819 Donglin-Kawai 2025A00441A.pdf