Oscillation and suppression of Kondo temperature by RKKY coupling in two-site Kondo systems

Nejati, Ammar; Kroha, Johann

doi:10.1088/1742-6596/807/8/082004

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…These oscillations are akin to T K variations reported for even longer intermediate Cu chains [54] and are therefore assigned to the same origin, i.e. to RKKY interactions [54,76]. It is remarkable-albeit not understood-that for m = 1, 2 the oscillation amplitude is larger than for m = 0.…”

Section: Resultsmentioning

confidence: 55%

Manipulation of the two-site Kondo effect in linear CoCu_nCoCu_m clusters

Néel

Shao

Wehling

2019

J. Phys.: Condens. Matter

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Artificially assembled linear atomic clusters, CoCu n CoCu m , are used to explore variations of the Kondo effect at the two Co sites. For all investigated Cu n chain lengths ( ) the addition of a single Cu atom to one edge Co atom of the chain ( ) strongly reduces the amplitude of the Abrikosov–Suhl–Kondo resonance of that Co atom. Concomitantly, the resonance line width is more than halved. On the contrary, the Kondo effect of the opposite edge Co atom remains unaffected. Hybridization together with the linear geometry of the cluster are likely to drive the effect.

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Section: Resultsmentioning

confidence: 55%

Manipulation of the two-site Kondo effect in linear CoCu_nCoCu_m clusters

Néel

Shao

Wehling

2019

J. Phys.: Condens. Matter

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“…[19] the RKKY coupling y cannot be varied continuously. The detailed analysis of that experiment will be published elsewhere [29].…”

Section: Rkky-coupled C-f Vertex and Renormalization Group-mentioning

confidence: 99%

Kondo Destruction in RKKY-Coupled Kondo Lattice and Multi-Impurity Systems

Nejati¹,

Ballmann²,

Kroha

2017

Phys. Rev. Lett.

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In a Kondo lattice, the spin exchange coupling between a local spin and the conduction electrons acquires nonlocal contributions due to conduction electron scattering from surrounding local spins and the subsequent RKKY interaction. It leads to a hitherto unrecognized interference of Kondo screening and the RKKY interaction beyond the Doniach scenario. We develop a renormalization group theory for the RKKY-modified Kondo vertex. The Kondo temperature T_{K}(y) is suppressed in a universal way, controlled by the dimensionless RKKY coupling parameter y. Complete spin screening ceases to exist beyond a critical RKKY strength y_{c} even in the absence of magnetic ordering. At this breakdown point, T_{K}(y) remains nonzero and is not defined for larger RKKY couplings y>y_{c}. The results are in quantitative agreement with STM spectroscopy experiments on tunable two-impurity Kondo systems. The possible implications for quantum critical scenarios in heavy-fermion systems are discussed.

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“…[6], and this subject is of actuality until present days, see e.g. [7]. For this reason, all subtleties of this problem should be clarified.…”

Section: Introductionmentioning

confidence: 99%