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Start Over Author "Gong, Feng" Journal journal of the american chemical society
10 results on '"Gong, Feng"'

2. Two-step relaxation in a linear tetranuclear dysprosium(III) aggregate showing single-molecule magnet behavior

Author

Yun-Nan Guo, Jinkui Tang, Hong-Jie Zhang, Gamez, Patrick, Lang Zhao, Shuang-Yan Lin, Ruiping Deng, and Gong-Feng Xu

Subjects
Rare earth metals -- Electric properties, Rare earth metals -- Chemical properties, Chemistry
Abstract

A two-step relaxation described by the sum of two modified Debye functions is seen in a new alkoxido-bridged linear tetranuclear [Dy.sup.III] aggregate displaying single-molecule magnet behavior with a large energy barrier. The compound has represented a model molecular aggregate with a two-step relaxation observed by frequency-dependent susceptibility, which has initiated investigations regarding the relaxation dynamics of lanthanide-based systems.

Published
2010

3. Strong axiality and Ising exchange interaction suppress zero-field tunneling of magnetization of an asymmetric Dy2 single-molecule magnet

Author

Yang Guo, Liviu F. Chibotaru, Liviu Ungur, Annie K. Powell, Hongjie Zhang, Yun-Nan Guo, Wolfgang Wernsdorfer, Jinkui Tang, Gong-Feng Xu, State Key Laboratory of Rare Resource Utilization, Changchun Institute of Applied Chemistry, Department of Chemistry, College of Science, Tianjin University of Commerce, Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Division of Quantum and Chemistry, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Institut of Inorganic Chemistry, and University of Karlsruhe (TH)

Subjects
[PHYS]Physics [physics], Condensed matter physics, 010405 organic chemistry, Chemistry, Exchange interaction, Relaxation (NMR), General Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, Catalysis, 0104 chemical sciences, Physics::Fluid Dynamics, Magnetization, Colloid and Surface Chemistry, Orders of magnitude (time), Ising model, Single-molecule magnet, Spin (physics), Axiality
Abstract

International audience; The high axiality and Ising exchange interaction efficiently suppress quantum tunneling of magnetization of an asymmetric dinuclear Dy-III complex, as revealed by combined experimental and theoretical investigations. Two distinct regimes of blockage of magnetization, one originating from the blockage at individual Dy sites and the other due to the exchange interaction between the sites, are separated for the first time. The latter contribution is found to be crucial, allowing an increase of the relaxation time by 3 orders of magnitude.

Published
2011

5. Two-Step Relaxation in a Linear Tetranuclear Dysprosium(III) Aggregate Showing Single-Molecule Magnet Behavior

Author

Jinkui Tang, Hongjie Zhang, Lang Zhao, Ruiping Deng, Yun-Nan Guo, Patrick Gamez, Shuang-Yan Lin, and Gong-Feng Xu

Subjects
Lanthanide, Aggregate (composite), Condensed matter physics, chemistry.chemical_element, General Chemistry, Biochemistry, Catalysis, symbols.namesake, Colloid and Surface Chemistry, chemistry, Ferromagnetism, Chemical physics, Magnet, Dysprosium, symbols, Relaxation (physics), Single-molecule magnet, Debye function
Abstract

A well-defined two-step relaxation, described by the sum of two modified Debye functions, is observed in a new alkoxido-bridged linear tetranuclear Dy(III) aggregate showing single-molecule magnet behavior with a remarkably large energy barrier. This compound represents a model molecular aggregate with a clear two-step relaxation evidenced by frequency-dependent susceptibility, which therefore may stimulate further investigations regarding the relaxation dynamics of lanthanide-based systems.

Published
2010

10. Strong Axiality and Ising Exchange Interaction Suppress Zero-Field Tunneling of Magnetization of an Asymmetric Dy2 Single-Molecule Magnet.

Author

Yun-Nan Guo, Gong-Feng Xu, Wernsdorfer, Wolfgang, Ungur, Liviu, Yang Guo, Jinkui Tang, Hong-Jie Zhang, Chibotaru, Liviu F., and Powell, Annie K.

Subjects
*ISING model, *MAGNETIZATION, *ASYMMETRIC synthesis, *MOLECULAR models, *MAGNETISM
Abstract

The high axiality and Ising exchange interaction efficiently suppress quantum tunneling of magnetization of an asymmetric dinuclear DyIII complex, as revealed by combined experimental and theoretical investigations. Two distinct regimes of blockage of magnetization, one originating from the blockage at individual Dy sites and the other due to the exchange interaction between the sites, are separated for the first time. The latter contribution is found to be crucial, allowing an increase of the relaxation time by 3 orders of magnitude. [ABSTRACT FROM AUTHOR]

Published
2011
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