| Magnetic Quantum Tunnelling in Faster Relaxation Process in Mn12Ac Molecular Magnets |
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| 作者姓名： | 刘海青 苏少奎 景秀年 刘颖 何伦华 葛培文 严启伟 王云平 |
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| 作者单位： | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080 |
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| 基金项目： | Supported partially by the National Natural Science Foundation of China under Grant No 10334080. |
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| 摘 要： |
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| 关 键 词： | 量子理论 隧道效应 磁性 松弛过程 |
| 收稿时间： | 2006-9-20 |
| 修稿时间： | 2006-09-20 |
Magnetic Quantum Tunnelling in Faster Relaxation Process in Mn12Ac Molecular Magnets |
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| LIU Hai-Qing,SU Shao-Kui,JING Xiu-Nian,LIU Ying,HE Lun-Hua,GE Pei-Wen,YAN Qi-Wei,WANG Yun-Ping.Magnetic Quantum Tunnelling in Faster Relaxation Process in Mn12Ac Molecular Magnets[J].Chinese Physics Letters,2007,24(2):532-535. |
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| Authors: | LIU Hai-Qing SU Shao-Kui JING Xiu-Nian LIU Ying HE Lun-Hua GE Pei-Wen YAN Qi-Wei WANG Yun-Ping |
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| Institution: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080 |
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| Abstract: | The field-tuned ac susceptibility of Mn12Ac single crystal has been measured as functions of temperature and frequency. Two relaxation processes appear in our measurement. One is related to the magnetic quantum tunnelling of a collective spin S = 12 by a 61 K magnetic barrier and it has been well studied, while the other is faster than the former and its mechanism is unclear. We find that the relaxation time for the faster process shows the minima at H = 0 and H = 3.4 kOe, indicating that the quantum tunnelling also takes place in this process while the resonant fields are different from what we have known before. |
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| Keywords: | 75 45 +j 75 50 Xx 73 43 Jn |
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