四极相互作用在镧系分子磁体隧穿动力学中的作用
The role of the quadrupolar interaction in the tunneling dynamics of lanthanide molecular magnets
摘要：
量子隧穿在分子磁体的低温磁化动力学中占主导地位，并呈现出强烈的系统依赖性。目前的讨论集中在铽（III）双（酞菁）（[TbPc $_2$ ] $^{-1}$）的配合物，这应该作为一个典型的情况下，镧系分子磁体。我们数值分析了非轴向相互作用对本征隧道分裂大小的影响，并表明通常的嫌疑人，如横向配位场和塞曼相互作用无法解释实验观察到的动力学。然后，我们提出通过核四极相互作用的可行机制，混合，否则\textit{almost}简并超精细状态。
英文摘要：
Quantum tunneling dominates the low temperature magnetization dynamics in molecular magnets and presents features that are strongly system dependent. The current discussion is focused on the terbium(III) bis(phtalocyanine) ([TbPc$_2$]$^{-1}$) complex, that should serve as a prototypical case for lanthanide molecular magnets. We analyze numerically the effect of non-axial interactions on the magnitude of the intrinsic tunnel splitting and show that usual suspects like the transverse ligand field and Zeeman interaction fail to explain the experimentally observed dynamics. We then propose through the nuclear quadrupolar interaction a viable mechanism that mixes, otherwise \textit{almost} degenerate hyperfine states.
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