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首页> 外文期刊>Physical review letters >Resonant Tunneling in Truly Axial Symmetry Mn_(12) Single-Molecule Magnets: Sharp Crossover between Thermally Assisted and Pure Quantum Tunneling
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Resonant Tunneling in Truly Axial Symmetry Mn_(12) Single-Molecule Magnets: Sharp Crossover between Thermally Assisted and Pure Quantum Tunneling

机译：轴对称Mn_（12）单分子磁体中的共振隧穿：热辅助和纯量子隧穿之间的尖锐交叉

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摘要

Magnetization measurements of a truly axial symmetry Mn_(12)-t BuAc molecular nanomagnet with a spin ground state of S = 10 show resonant tunneling. This compound has the same magnetic anisotropy as Mn_(12)-Ac but the molecules are better isolated and the crystals have less disorder and a higher symmetry. Hysteresis loop measurements at several temperatures reveal a well-resolved step fine structure which is due to level crossings of excited states. All step positions can be modeled by a simple spin Hamiltonian. The results establish a sharp crossover between thermally assisted and pure quantum tunneling, as had been previously predicted.
机译：自旋基态为S = 10的真正轴向对称的Mn_（12）-t BuAc分子纳米磁体的磁化测量显示共振隧穿。该化合物具有与Mn_（12）-Ac相同的磁各向异性，但分子的分离度更好，晶体的杂乱度较小且对称性较高。在几个温度下的磁滞回线测量显示出一个良好解析的阶梯精细结构，这是由于激发态的能级交叉。所有步位置都可以通过简单的自旋哈密顿量建模。如先前所预测的，结果在热辅助隧道和纯量子隧道之间建立了一个尖锐的交叉点。

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