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arXiv · 2012.11781

Unusual Scaling of Kondo Spin Relaxation

Xingyu Shen·Yi Ji
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Abstract

The relation between the Kondo spin relaxation rate $ {\tau_{sK}}^{-1} $ and the Kondo momentum relaxation rate $ {\tau_{eK}}^{-1} $ is explored by using nonlocal spin valves with submicron copper channels that contain dilute iron impurities. A linear relation between $ {\tau_{sK}}^{-1} $ and $ {\tau_{eK}}^{-1} $ is established under varying temperatures. However, under varying impurity concentrations, ${\tau_{sK}}^{-1}$ remains nearly constant despite variation of $ {\tau_{eK}}^{-1} $ by a factor of 10. This surprising relation can be understood by considering spin relaxation through overlapping Kondo screening clouds and supports the physical existence of the elusive Kondo clouds.

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Xingyu Shen, Yi Ji. 2020-12-22. Unusual Scaling of Kondo Spin Relaxation. https://doi.org/10.1103/physrevb.104.085101

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