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)

• 来源期刊: 中国物理（英文版）
• 关键词: quantum tunnelling of magnetization magnetization relaxation single molecule magnet
• 年，卷（期）: 2007,（6）
• 页码范围: 1776-1779
• 页数: 4页
• 语种: 英文

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 Mnl2 core.