中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1776-1779.doi: 10.1088/1009-1963/16/6/050
何光1, 何伦华2, 张俊荣2, 曹慧波2, 阎丽琴2, 王芳卫2, 严启伟2
He Guang(何光)a), He Lun-Hua(何伦华)b)†, Zhang Jun-Rong(张俊荣)b), Cao Hui-Bo(曹慧波)b), Yan Li-Qin(阎丽琴)b), Wang Fang-Wei(王芳卫)b), and Yan Qi-Wei(严启伟)b)
摘要: 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.
中图分类号: (Macroscopic quantum phenomena in magnetic systems)