Ferromagnetic Kondo Effect at Nanocontacts

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dc.creatorGentile, Paola
dc.creatorDe Leo, Lorenzo
dc.creatorFabrizio, Michele
dc.creatorTosatti, Erio
dc.date2009-02-02
dc.date.accessioned2026-07-07T12:36:57Z
dc.date.available2026-07-07T12:36:57Z
dc.descriptionMagnetic impurities bridging nanocontacts and break junctions of nearly magnetic metals may lead to permanent moments, analogous to the giant moments well known in the bulk case. A numerical renormalization group (NRG) study shows that, contrary to mean field based expectations, a permanent moment never arises within an Anderson model, which invariably leads to strong Kondo screening. By including in the model an additional ferromagnetic exchange coupling between leads and impurity, the NRG may instead stabilize a permanent moment through a ferromagnetic Kondo effect. The resulting state is a rotationally invariant spin, which differs profoundly from mean field. A sign inversion of the zero-bias anomaly and other spectroscopic signatures of the switch from regular to ferromagnetic Kondo are outlined.
dc.description5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0902.0254
dc.identifierhttp://arxiv.org/abs/0902.0254
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218275
dc.subjectStrongly Correlated Electrons
dc.titleFerromagnetic Kondo Effect at Nanocontacts
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