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arXiv · 1206.6069

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

Maciej Misiorny·Ireneusz Weymann·Józef Barnaś
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Abstract

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 J 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. Moreover, additional peaks are found in the linear conductance for temperatures of the order of T\sim|J| and T\simD. It is also shown that the conductance variation with T remarkably depends on the sign of the exchange coupling J.

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Maciej Misiorny, Ireneusz Weymann, Józef Barnaś. 2012-06-26. Temperature dependence of electronic transport through molecular magnets in the Kondo regime. https://doi.org/10.1103/physrevb.86.035417

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