Highly Degenerate Ground States in a Frustrated Antiferromagnetic Kagome Lattice in a Two-Dimensional Metal-Organic Framework

Hua，Muqing1; Xia，Bowen1,2; Wang，Miao3; Li，En1; Liu，Jing4; Wu，Tianhao5; Wang，Yifan5; Li，Ruoning5; Ding，Honghe6; Hu，Jun6; Wang，Yongfeng4,5; Zhu，Junfa6; Xu，Hu2; Zhao，Wei3; Lin，Nian1

2021

10.1021/acs.jpclett.1c00598

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

Realization of the Kagome antiferromagnetic (KAF) lattice is of high interest because the geometric frustration in the Kagome lattice is expected to give rise to highly degenerated ground states that may host exotic phases such as quantum spin liquid. Here we demonstrate the design and synthesis of a single-layer two-dimensional metal-organic framework (2D-MOF) containing a Kagome lattice of Fe(II) ions assembled on a Au(111) surface. First-principles calculations reveal that the Fe(II) ions are at a high spin state of S = 2 and are coupled antiferromagnetically with nearest-neighboring exchange J1 = 5.8 meV. The ground state comprises various degenerated spin configurations including the well-known q = 0 and q = √3 × √3 phases. Remarkably, we observe a spin excitation at 6 meV using tunneling spectroscopy. This work points out a feasible route toward realizing spin 1/2 KAF, a candidate quantum spin liquid system, by replacing Fe(II) by Cu(II) in the same structure.

SCI ; EI

英语

NI论文

其他

WOS:000644438200007

20211910312838

Antiferromagnetism ; Calculations ; Copper compounds ; Gold compounds ; Ground state ; Metal-Organic Frameworks ; Organometallics ; Quantum theory ; Scanning tunneling microscopy ; Spin fluctuations

Magnetism: Basic Concepts and Phenomena:701.2 ; Organic Compounds:804.1 ; Mathematics:921 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

2-s2.0-85105106690

Scopus

1.Department of Physics,Hong Kong University of Science and Technology,Hong Kong,Hong Kong
2.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
3.Institute for Advanced Study,Shenzhen University,Shenzhen,518060,China
4.Division of Quantum State of Matter,Beijing Academy of Quantum Information Sciences,Beijing,100193,China
5.Key Laboratory for the Physics and Chemistry of Nanodevices,Center for Carbon-based Electronics,Department of Electronics,Peking University,Beijing,100871,China
6.National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei,230029,China

Hua，Muqing,Xia，Bowen,Wang，Miao,et al. Highly Degenerate Ground States in a Frustrated Antiferromagnetic Kagome Lattice in a Two-Dimensional Metal-Organic Framework[J]. Journal of Physical Chemistry Letters,2021,12:3733-3739.

Hua，Muqing.,Xia，Bowen.,Wang，Miao.,Li，En.,Liu，Jing.,...&Lin，Nian.(2021).Highly Degenerate Ground States in a Frustrated Antiferromagnetic Kagome Lattice in a Two-Dimensional Metal-Organic Framework.Journal of Physical Chemistry Letters,12,3733-3739.

Hua，Muqing,et al."Highly Degenerate Ground States in a Frustrated Antiferromagnetic Kagome Lattice in a Two-Dimensional Metal-Organic Framework".Journal of Physical Chemistry Letters 12(2021):3733-3739.