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

Journal Article · · Nanoscale
DOI: https://doi.org/10.1039/c8nr08479c · OSTI ID:1543815
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Univ. of Utah, Salt Lake City, UT (United States); Univ. of Minnesota, Minneapolis, MN (United States)
  2. Tsinghua Univ., Beijing (China)
  3. Southern Univ. of Science and Technology, Shenzhen (China)
  4. Shandong Univ., Jinan (China)
  5. Univ. of Utah, Salt Lake City, UT (United States)

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 demonstrate, 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
FG02-04ER46148
OSTI ID:
1543815
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 3 Vol. 11; ISSN NANOHL; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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