Symmetry strategies for high performance lanthanide-based single-molecule magnets

Toward promising candidates of quantum information processing, the rapid development of lanthanide-based single-molecule magnets (Ln-SMMs) highlights design strategies in consideration of the local symmetry of lanthanide ions. In this review, crystal-field theory is employed to demonstrate the elect...

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Published inChemical Society reviews Vol. 47; no. 7; pp. 2431 - 2453
Main Authors Liu, Jun-Liang, Chen, Yan-Cong, Tong, Ming-Liang
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 03.04.2018
Subjects
Crystal field theory
Crystal structure
Data processing
information processing
ions
Magnetic induction
magnetic materials
Magnetic properties
magnetism
Magnetization
Magnets
Quantum phenomena
Quantum theory
Quantum tunnelling
Symmetry
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Summary:Toward promising candidates of quantum information processing, the rapid development of lanthanide-based single-molecule magnets (Ln-SMMs) highlights design strategies in consideration of the local symmetry of lanthanide ions. In this review, crystal-field theory is employed to demonstrate the electronic structures according to the semiquantitative electrostatic model. Then, specific symmetry elements are analysed for the elimination of transverse crystal fields and quantum tunnelling of magnetization (QTM). In this way, high-performance Ln-SMMs can be designed to enable extremely slow relaxation of magnetization, namely magnetic blocking; however, their practical magnetic characterization becomes increasingly challenging. Therefore, we will attempt to interpret the experimental behaviours and clarify some issues in detail. Finally, representative Ln-SMMs with specific local symmetries are summarized in combination with the discussion on the symmetry strategies, and some of the underlying questions are put forward. Based on crystal-field theory, design strategies in consideration of local symmetry are highlighted for lanthanide-based single-molecule magnets, accompanied by practical concerns about magnetic studies and representative cases.
Bibliography:Dr Yan-Cong Chen obtained his PhD degree (Inorganic Chemistry) from Sun Yat-Sen University in 2017, under the supervision of Prof. Ming-Liang Tong. He has been responsible for magnetic measurements since 2012 and he is currently conducting postdoctoral research in the same laboratory supported by the National Postdoctoral Program for Innovative Talents. His research interests include the design, synthesis and characterization of various molecule-based magnetic materials such as single-molecule magnets, molecular magnetic coolants and spin crossover materials.
Prof. Ming-Liang Tong obtained his PhD from Sun Yat-Sen University in 1999, under the supervision of Prof. Xiao-Ming Chen. Then he joined the faculty at SYSU and was promoted to a Professor in 2004. In 2001, he worked as a JSPS postdoctoral fellow with Prof. Susumu Kitagawa in Kyoto University. He was elected as "Changjiang Scholar" in 2014 by the Ministry of Education and he is currently vice dean of the School of Chemistry, SYSU. His research interests cover low-dimensional molecular magnets (SMMs and SCMs), cryogenic molecular magnetic coolants, spin crossover and multifunctional molecular materials.
Dr Jun-Liang Liu obtained his PhD degree (Materials Physics and Chemistry) in 2015 from Sun Yat-Sen University, under the supervision of Prof. Ming-Liang Tong. Following a postdoctoral fellow at the Centre de Recherche Paul Pascal, CNRS, with Dr Rodolphe Clérac, he joined SYSU as an associate researcher in 2016. His research interests are focused on the design, synthesis and analysis of molecule-based magnets, especially lanthanide-based single-molecule magnets.
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ISSN:0306-0012
1460-4744
1460-4744
DOI:10.1039/c7cs00266a