Hundness versus Mottness in a three-band Hubbard–Hund model: On the origin of strong correlations in Hund metals

Stadler, K. M.; Kotliar, Gabriel; Weichselbaum, Andreas; Delft, Jan von

doi:10.1016/j.aop.2018.10.017

Cited by 85 publications

(142 citation statements)

References 74 publications

Supporting

Mentioning

134

Contrasting

Order By: Relevance

“…3 In the pnictides, selective Mott physics is more relevant for the hole doped side close to half-filling, where charge ordering indeed has been observed experimentally 13,14 . For electron doping, Mott physics is not relevant 17 , but Hund's coupling J 75 can lead to correlations which can induce inhomogeneities and charge order as well 76,77 . Our experimental observation of a nanoscale charge separation in LaFeAsO 1−x F x demonstrates that inhomogeneities or charge order is not limited to the hole-doped side, but also occurs in electron-doped iron pnictides.…”

Section: Discussionmentioning

confidence: 99%

Unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters

et al. 2020

View full text Add to dashboard Cite

We present 75 As Nuclear Magnetic and Quadrupole Resonance results (NMR, NQR) on a new set of LaFeAsO1−xFx polycrystalline samples. Improved synthesis conditions led to more homogenized samples with better control of the fluorine content. The structural≡nematic, magnetic, and superconducting transition temperatures have been determined by NMR spin-lattice relaxation rate and AC susceptibility measurements. The so-determined phase diagram deviates from the published one especially for low F-doping concentrations. However, if the doping level is determined from the NQR spectra, both phase diagrams can be reconciled. The absence of bulk coexistence of magnetism and superconductivity and a nanoscale separation into low-doping-like and high-doping-like regions have been confirmed. Additional frequency dependent intensity, spin-spin, and spin-lattice relaxation rate measurements on underdoped samples at the boundary of magnetism and superconductivity indicate that orthorhombicity and magnetism originate from the low-doping-like regions, and superconductivity develops at first in the high-doping-like regions.arXiv:2003.00733v1 [cond-mat.supr-con]

show abstract

Section: Discussionmentioning

confidence: 99%

Unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters

et al. 2020

View full text Add to dashboard Cite

show abstract

“…A very direct observation of Fermi-liquid behavior is possible by studying the renormalization group flow diagram of the NRG algorithm [6,9,18,19]. Figure 1 i .…”

mentioning

confidence: 99%

Strongly Correlated Materials from a Numerical Renormalization Group Perspective: How the Fermi-Liquid State of Sr2RuO4 Emerges

et al. 2020

View full text Add to dashboard Cite

The crossover from fluctuating atomic constituents to a collective state as one lowers temperature/energy is at the heart of the dynamical mean-field theory description of the solid state. We demonstrate that the numerical renormalization group is a viable tool to monitor this crossover in a real-materials setting. The renormalization group flow from high to arbitrarily small energy scales clearly reveals the emergence of the Fermi-liquid state of Sr2RuO4. We find a two-stage screening process, where orbital fluctuations are screened at much higher energies than spin fluctuations, and Fermi-liquid behavior, concomitant with spin coherence, below a temperature of 25 K. By computing real-frequency correlation functions, we directly observe this spin-orbital scale separation and show that the van Hove singularity drives strong orbital differentiation. We extract quasiparticle interaction parameters from the low-energy spectrum and find an effective attraction in the spin-triplet sector.arXiv:1909.02389v1 [cond-mat.str-el]

show abstract

“…Most interestingly, recent works 18,[29][30][31] suggest that these findings are just an aspect of a more general phenomenon -spin-orbit separation -which is not restricted to lattice models, but already emerges from the physics of the multi-orbital impurity model with Hund's coupling. In the multi-orbital Anderson impurity model, the competition between Hund's coupling and Kondo screening gives rise to an intermediate regime, where the Kondo scales of orbitals T orb bital degrees of freedom are screened by the conduction electrons.…”

Section: Introductionmentioning

confidence: 99%

“…This gives rise to a large local spin moment, at which conduction electrons are scattered, and results in strong decoherence and non-Fermi liquid behavior. Only below T sp K , Fermi liquid behavior is recovered 18,22,29,32,33 . In Ref.…”

Section: Introductionmentioning

confidence: 99%

Doping-driven metal-insulator transition in correlated electron systems with strong Hund's exchange coupling

2019

View full text Add to dashboard Cite

We study the doping-driven Mott metal-insulator transition for multi-orbital Hubbard models with Hund's exchange coupling at finite temperatures. As in the single-orbital Hubbard model, the transition is of first-order within dynamical mean field theory, with a coexistence region where two solutions can be stabilized. We find, that in the presence of finite Hund's coupling, the insulating phase is connected to a badly metallic phase, which extends to surprisingly large dopings. While fractional power-law behavior of the self-energies on the Matsubara axis is found on both sides of the transition, a regime with frozen local moments develops only on the branch connected to the insulating phase.

show abstract

Hundness versus Mottness in a three-band Hubbard–Hund model: On the origin of strong correlations in Hund metals

Cited by 85 publications

References 74 publications

Unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters

Unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters

Strongly Correlated Materials from a Numerical Renormalization Group Perspective: How the Fermi-Liquid State of Sr2RuO4 Emerges

Doping-driven metal-insulator transition in correlated electron systems with strong Hund's exchange coupling

Contact Info

Product

Resources

About