| Resonant tunnelling of the magnetization in molecular crystal of [（Mn1-xCrx）12O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O（x=0,0.03,0.04,0.05） |
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| 引用本文： | 何光,何伦华,张俊荣,曹慧波,阎丽琴,王芳卫,严启伟.Resonant tunnelling of the magnetization in molecular crystal of [（Mn1-xCrx）12O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O（x=0,0.03,0.04,0.05）[J].中国物理 B,2007,16(6):1776-1779. |
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| 作者姓名： | 何光 何伦华 张俊荣 曹慧波 阎丽琴 王芳卫 严启伟 |
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| 作者单位： | School of Physics & Electronic Engineering, The Central University of Nationalities, Beijing 100081, China;State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China;State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China |
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| 基金项目： | Project supported by the National
Natural Science Foundation of China (Grant No 10505029). |
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| 摘 要： | The quantum tunnelling of magnetization （QTM） in single crystals of the single molecule magnet （Mn1-xCrx）12- Ac （x=0, 0.03, 0.04, 0.05） has been investigated. In comparison with its parent Mnl2-Ac, a greater rate of magnetization relaxation and a lower effective potential-energy barrier have been observed in Cr-doping samples. This modulation of QTM due to the Cr-doping could be attributed to the small change of Sz due to the smaller spin of Cr itself and additional intrinsic but distributed transverse and longitudinal anisotropy raised by a subtle change of the local environment in the magnetic Mn12 core.
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| 关 键 词： | 分子晶体 单分子磁体 共振 磁化 量子隧穿效应 锰 铬 |
| 收稿时间： | 2006-10-24 |
Resonant tunnelling of the magnetization in molecular crystal of [（Mn1-xCrx）12O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O（x=0,0.03,0.04,0.05） |
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| He Guang,He Lun-Hu,Zhang Jun-Rong,Cao Hui-Bo,Yan Li-Qin,Wang Fang-Wei and Yan Qi-Wei.Resonant tunnelling of the magnetization in molecular crystal of [（Mn1-xCrx）12O12 （CH3COO）16（H2O）4]·2CH3COOH·4H2O（x=0,0.03,0.04,0.05）[J].Chinese Physics B,2007,16(6):1776-1779. |
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| Authors: | He Guang He Lun-Hu Zhang Jun-Rong Cao Hui-Bo Yan Li-Qin Wang Fang-Wei and Yan Qi-Wei |
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| Institution: | School of Physics & Electronic Engineering, The Central University of Nationalities, Beijing 100081, China
; State Key Laboratory for Magnetism, Institute of
Physics, Chinese Academy of Sciences, Beijing 100080,
China |
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| Abstract: | The quantum tunnelling of magnetization (QTM) in single crystals of
the single molecule magnet (Mn$_{1-x}$Cr$_x$)12-Ac ($x$=0, 0.03,
0.04, 0.05) has been investigated. In comparison with its parent
Mn12-Ac, a greater rate of magnetization relaxation and a lower
effective potential-energy barrier have been observed in Cr-doping
samples. This modulation of QTM due to the Cr-doping could be
attributed to the small change of $S_z$ due to the smaller spin of Cr
itself and additional intrinsic but distributed transverse and
longitudinal anisotropy raised by a subtle change of the local
environment in the magnetic Mn12 core. |
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| Keywords: | quantum tunnelling of
magnetization magnetization relaxation single molecule magnet |
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