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Temperature dependence of electronic transport through molecular magnets in the Kondo regime

机译：近藤状态下通过分子磁体的电子传输的温度依赖性

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摘要

The effects of finite temperature in transport through nanoscopic systems exhibiting uniaxial magnetic anisotropy D, such as molecular magnets, adatoms, or quantum dots side coupled to a large spin, are analyzed in the Kondo regime. The linear-response conductance is calculated by means of the full density-matrix numerical renormalization group method as a function of temperature T, magnetic anisotropy D, and exchange coupling ./ between the molecule's core spin and the orbital level. It is shown that such system displays a two-stage Kondo effect as a function of temperature and a quantum phase transition as a function of the exchange coupling J. These effects become, however, suppressed by finite magnetic anisotropy, provided the exchange coupling is sufficiently strong. Moreover, additional peaks are found in the linear conductance for temperatures of the order of T ~ J and T ~ D.It is also shown that the conductance variation with T remarkably depends on the sign of the exchange coupling J.
机译：在近藤研究中分析了有限温度在通过表现出单轴磁各向异性D的纳米系统（例如分子磁体，原子或与大自旋耦合的量子点）传输的纳米系统中的影响。线性响应电导是通过全密度矩阵数值重归一化组方法计算的，该方法是温度T，磁各向异性D以及分子核心自旋与轨道能级之间交换耦合的函数。结果表明，这样的系统显示出随温度变化的两级近藤效应和随着交换耦合J的量子相变。然而，只要交换耦合足够，这些效应就会受到有限的磁各向异性的抑制。强大。此外，在温度为T〜J和T〜D的线性电导中还发现了其他峰值，这也表明电导随T的变化明显取决于交换耦合J的符号。

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