Definitive spectroscopic determination of the transverse interactions responsible for the magnetic quantum tunneling in Mn(12)-acetate.
Definitive spectroscopic determination of the transverse interactions responsible for the magnetic quantum tunneling in Mn(12)-acetate.
复制标题
负责 Mn(12)-乙酸盐中磁量子隧道效应的横向相互作用的明确光谱测定。
DOI：
10.1103/physrevlett.90.217204
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发表时间：
2003
影响因子：
8.6
通讯作者：
J. North
中科院分区：
文献类型：
--
作者：
Stephen Hill;Rachel S. Edwards;Shaela I. Jones;Naresh S. Dalal;J. North
我们给出了S=10单分子磁体Mn(12)-醋酸盐硬平面上场旋转的详细的角度相关单晶电子顺磁共振（EPR）数据。共振位置的明显四倍变化可归因于固有的四阶横向各向异性(O（4)/(4)）。同时，EPR线形状的四倍变化证实了最近提出的一个模型，其中与结晶乙酸相关的紊乱引起局部变化的二次（菱形）横向各向异性[O(2)/(2)与E(S (2)/(x)-S(2)/(y)相同]。这些发现解释了在Mn(12)-乙酸中观察到的磁性量子隧穿的大多数方面。
We present detailed angle-dependent single crystal electron paramagnetic resonance (EPR) data for field rotations in the hard plane of the S=10 single molecule magnet Mn(12)-acetate. A clear fourfold variation in the resonance positions may be attributed to an intrinsic fourth-order transverse anisotropy (O(4)/(4)). Meanwhile, a fourfold variation of the EPR line shapes confirms a recently proposed model wherein disorder associated with the acetic acid of crystallization induces a locally varying quadratic (rhombic) transverse anisotropy [O (2)/(2) identical with E(S (2)/(x)-S(2)/(y))]. These findings explain most aspects of the magnetic quantum tunneling observed in Mn(12)-acetate.