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Issue 3, 2019
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Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework

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Abstract

Dichotomy between local spins and conjugated electrons spawns various exotic physical phenomena, however, it has mostly been reported in three-dimensional (3D) inorganic systems. We show, for the first time, that a rare 2D metal–organic framework exhibits intriguing dichotomy behavior, which can be directly identified through scanning tunneling microscopy/spectroscopy (STM/STS). In a newly synthesized Cu-hexaiminobenzene [Cu3(HAB)2], on the one hand, the Cu2+ ions form an ideal S − 1/2 antiferromagnetic (AFM) kagome lattice; on the other hand, the conjugated-electrons from the organic ligands produce a frustrated πx,y model on a honeycomb lattice, giving rise to completely dispersionless energy bands around the Fermi level that favour the ferromagnetic (FM) state. Remarkably, the frustrated local spins and conjugated electrons interact through a strong FM Hund's coupling, giving rise to a wide range of intriguing quantum phases. Furthermore, we propose that this dichotomy can be directly characterized through STM/STS measurements due to its special 2D nature, which provides a unique exciting platform to investigate the dichotomy of frustrated spins and electrons in a single lattice.

Graphical abstract: Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework

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Article information


Submitted
19 Oct 2018
Accepted
20 Nov 2018
First published
23 Nov 2018

Nanoscale, 2019,11, 955-961
Article type
Paper
Author version available

Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework

W. Jiang, Z. Liu, J. Mei, B. Cui and F. Liu, Nanoscale, 2019, 11, 955
DOI: 10.1039/C8NR08479C

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