Thermal spin-crossover and temperature-dependent zero-field splitting in magnetic nanographene chains
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913452848578560 |
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| author | Wang, Yan Paz, Alejandro Pérez Boström, Emil Viñas Zhang, Xiaoxi Li, Juan Berger, Reinhard Liu, Kun Ma, Ji Huang, Li Du, Shixuan Gao, Hong-jun Müllen, Klaus Narita, Akimitsu Feng, Xinliang Rubio, Angel Palma, CA |
| author_facet | Wang, Yan Paz, Alejandro Pérez Boström, Emil Viñas Zhang, Xiaoxi Li, Juan Berger, Reinhard Liu, Kun Ma, Ji Huang, Li Du, Shixuan Gao, Hong-jun Müllen, Klaus Narita, Akimitsu Feng, Xinliang Rubio, Angel Palma, CA |
| contents | Nanographene-based magnetism at interfaces offers an avenue to designer quantum materials towards novel phases of matter and atomic-scale applications. Key to spintronics applications at the nanoscale is bistable spin-crossover which however remains to be demonstrated in nanographenes. Here we show that antiaromatic 1,4-disubstituted pyrazine-embedded nanographene derivatives, which promote magnetism through oxidation to a non-aromatic radical are prototypical models for the study of carbon-based thermal spin-crossover. Scanning tunneling spectroscopy studies reveal symmetric spin excitation signals which evolve at Tc to a zero-energy peak, and are assigned to the transition of a S = 3/2 high-spin to a S = 1/2 low-spin state by density functional theory. At temperatures below and close to the spin-crossover Tc, the high-spin S= 3/2 excitations evidence pronouncedly different temperature-dependent excitation energies corresponding to a zero-field splitting in the Hubbard-Kanamori Hamiltonian. The discovery of thermal spin crossover and temperature-dependent zero-field splitting in carbon nanomaterials promises to accelerate quantum information, spintronics and thermometry at the atomic scale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20996 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermal spin-crossover and temperature-dependent zero-field splitting in magnetic nanographene chains Wang, Yan Paz, Alejandro Pérez Boström, Emil Viñas Zhang, Xiaoxi Li, Juan Berger, Reinhard Liu, Kun Ma, Ji Huang, Li Du, Shixuan Gao, Hong-jun Müllen, Klaus Narita, Akimitsu Feng, Xinliang Rubio, Angel Palma, CA Chemical Physics Nanographene-based magnetism at interfaces offers an avenue to designer quantum materials towards novel phases of matter and atomic-scale applications. Key to spintronics applications at the nanoscale is bistable spin-crossover which however remains to be demonstrated in nanographenes. Here we show that antiaromatic 1,4-disubstituted pyrazine-embedded nanographene derivatives, which promote magnetism through oxidation to a non-aromatic radical are prototypical models for the study of carbon-based thermal spin-crossover. Scanning tunneling spectroscopy studies reveal symmetric spin excitation signals which evolve at Tc to a zero-energy peak, and are assigned to the transition of a S = 3/2 high-spin to a S = 1/2 low-spin state by density functional theory. At temperatures below and close to the spin-crossover Tc, the high-spin S= 3/2 excitations evidence pronouncedly different temperature-dependent excitation energies corresponding to a zero-field splitting in the Hubbard-Kanamori Hamiltonian. The discovery of thermal spin crossover and temperature-dependent zero-field splitting in carbon nanomaterials promises to accelerate quantum information, spintronics and thermometry at the atomic scale. |
| title | Thermal spin-crossover and temperature-dependent zero-field splitting in magnetic nanographene chains |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2407.20996 |