Chin. Phys. Lett.  2007, Vol. 24 Issue (2): 532-535    DOI:
Original Articles |
Magnetic Quantum Tunnelling in Faster Relaxation Process in Mn12Ac Molecular Magnets
LIU Hai-Qing;SU Shao-Kui;JING Xiu-Nian;LIU Ying;HE Lun-Hua;GE Pei-Wen;YAN Qi-Wei;WANG Yun-Ping
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080
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LIU Hai-Qing, SU Shao-Kui, JING Xiu-Nian et al  2007 Chin. Phys. Lett. 24 532-535
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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 61K 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=3.4kOe, indicating that the quantum tunnelling also takes place in this process while the resonant fields are different from what we have known before.
Keywords: 75.45.+j      75.50.Xx      73.43.Jn     
Received: 20 September 2006      Published: 24 February 2007
PACS:  75.45.+j (Macroscopic quantum phenomena in magnetic systems)  
  75.50.Xx (Molecular magnets)  
  73.43.Jn (Tunneling)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2007/V24/I2/0532
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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
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