| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Resonance-assisted drastic transition in single-molecule magnets |
| Lei Gu(古磊)1,†, Jia Luo(罗佳)1, Ruqian Wu2, and Guoping Zhao(赵国平)1,3,‡ |
1 College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China;
2 Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;
3 Center for Magnetism and Spintronics, Sichuan Normal University, Chengdu 610068, China |
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Abstract Using exact diagonalization of the Hamiltonian and transition matrix in the energy eigenbasis, we perform model calculations of the magnetic relaxation rate in single-molecule magnets. A careful examination of the transition matrix reveals that resonant tunneling does not enhance transitions between the nearly degenerate states; rather, it suppresses them. Instead, transitions from one state in the degenerate pair to neighboring states of the other are significantly enhanced. We conduct a detailed analysis of the transition rates to clearly demonstrate how resonant tunneling modulates these processes. This work provides a substantial reinterpretation of the resonant magnetic relaxation in single-molecule magnets and clearly identifies the dominant relaxation pathways.
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Received: 06 May 2025
Revised: 23 June 2025
Accepted manuscript online: 26 June 2025
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PACS:
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75.50.Xx
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(Molecular magnets)
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76.30.-v
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(Electron paramagnetic resonance and relaxation)
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76.60.Es
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(Relaxation effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12404085, 12474122, 52171188, 51771127, and 52111530143), the Fund from DOE-BES (Grant No. DE-FG02-05ER46237), and the Central Government Funds of Guiding Local Scientific and Technological Development for Sichuan Province, China (Grant No. 2021ZYD0025). |
Corresponding Authors:
Lei Gu, Guoping Zhao
E-mail: gulei@sicnu.edu.cn;zhaogp@uestc.edu.cn
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Cite this article:
Lei Gu(古磊), Jia Luo(罗佳), Ruqian Wu, and Guoping Zhao(赵国平) Resonance-assisted drastic transition in single-molecule magnets 2025 Chin. Phys. B 34 127501
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