Emergent moments in a Hund's impurity

Drouin-Touchette, Victor; König, Elio J.; Komijani, Yashar; Coleman, Piers

doi:10.1103/physrevb.103.205147

Cited by 13 publications

(18 citation statements)

References 37 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In reality, J H may be given by the RKKY interaction and oscillate with R. Then the observed phase diagram might be distorted. In particular, for a ferromagnetic spin interaction (J H < 0), there will be no frustration and intermediate phases 11 , and the three impurity spins will align and form an effective large spin to be fully screened by conduction electrons. Nevertheless, we believe that the SCK effect is a widely existing property in frustrated Kondo systems and may be responsible for the metallic spin liquid state in frustrated Kondo lattice [4][5][6][7][8] .…”

Section: Discussionmentioning

confidence: 99%

“…The nature of these exotic phases is still under debate 3,4,8 . A minimum model for studying the interplay between geometric frustrations and the many-body Kondo coupling is the three impurity Kondo model (3IKM) [9][10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

“…Evidently, a prerequisite of the SCK is the existence of elec-tron spin or charge currents. Previous studies on 3IKM usually assumed independent electron baths [9][10][11] and thus forbid such current flow. Our work is based on an improved treatment of the nonlocal spin current interaction in a shared-bath model and the NFL ground states may have a lower energy due to the transfer of Kondo singlets between impurity sites 12 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin current Kondo effect in frustrated Kondo systems

Wang,

Yang

2021

Preprint

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spin current Kondo effect in frustrated Kondo systems

Wang,

Yang

2021

Preprint

View full text Add to dashboard Cite

“…Resolving these issues requires a technique that is applicable to arbitrary dimensions and goes beyond static mean-field and DMFT by capturing both quantum and spatial fluctuations. Here we show that dynamical large-N approach, recently applied successfully to study Kondo lattices [16,[27][28][29][30][31][32][33][34], is precisely such a technique.…”

mentioning

confidence: 93%

Emergent Spinon Dispersion and Symmetry Breaking in Two-channel Kondo Lattices

Ge,

Komijani

2022

Preprint

Self Cite

View full text Add to dashboard Cite

Two-channel Kondo lattice serves as a model for a growing family of heavy-fermion compounds. We employ dynamical large-N technique and go beyond the independent bath approximation to study this model both numerically and analytically using renormalization group ideas. We show that Kondo effect induces dynamic magnetic correlations that lead to an emergent spinon dispersion. Furthermore, we develop a quantitative framework that interpolates between infinite dimension where the channel-symmetry broken results of mean-field theory are confirmed, and one-dimension where the channel symmetry is restored and a critical fractionalized mode is found.

show abstract

“…The link between large moments generated by Hund's coupling and the exponential reduction of Fermi liquid scales in Kondo impurity models has been studied extensively [23][24][25][26][27][28]. However, the physical valence of Fe or Ru atoms in Hund's metals deviates from half-filled shells.…”

mentioning

confidence: 99%

Interplay of charge and spin fluctuations in a Hund's coupled impurity

Drouin-Touchette¹,

König²,

Komijani³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

In Hund's metals, the local ferromagnetic interaction between orbitals leads to an emergence of complex electronic states with large and slowly fluctuating magnetic moments. Introducing a new analysis of a Hund's coupled mixed valence quantum impurity, we gain analytic insight into recent numerical renormalization group studies. We show that valence fluctuations drastically impedes the development of a large fluctuating moment over a wide swath of temperatures and energy, characterized by quenched orbital degrees of freedom and a singular logarithmic behavior of the spin susceptibility χ sp (ω) ∝ [ω log(ω/T eff K ) 2 ] −1 , closely resembling power-law scaling χ sp (ω) ∼ ω −γ . These singular spin fluctuations may play an important role in future models of Hund's driven Cooper pairing.

show abstract

Emergent moments in a Hund's impurity

Cited by 13 publications

References 37 publications

Spin current Kondo effect in frustrated Kondo systems

Spin current Kondo effect in frustrated Kondo systems

Emergent Spinon Dispersion and Symmetry Breaking in Two-channel Kondo Lattices

Interplay of charge and spin fluctuations in a Hund's coupled impurity

Contact Info

Product

Resources

About