TY - JOUR
T1 - Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal-organic framework
AU - Jiang, Wei
AU - Liu, Zheng
AU - Mei, Jia Wei
AU - Cui, Bin
AU - Liu, Feng
N1 - Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019/1/21
Y1 - 2019/1/21
N2 - 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 [Cu 3 (HAB) 2 ], on the one hand, the Cu 2+ 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 π x,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.
AB - 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 [Cu 3 (HAB) 2 ], on the one hand, the Cu 2+ 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 π x,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.
UR - http://www.scopus.com/inward/record.url?scp=85060124579&partnerID=8YFLogxK
U2 - 10.1039/c8nr08479c
DO - 10.1039/c8nr08479c
M3 - Article
C2 - 30652715
AN - SCOPUS:85060124579
SN - 2040-3364
VL - 11
SP - 955
EP - 961
JO - Nanoscale
JF - Nanoscale
IS - 3
ER -