Emergence of flat bands and ferromagnetic fluctuations via orbital-selective electron correlations in Mn-based kagome metal

Abstract

Kagome lattice has been actively studied for the possible realization of frustration-induced two-dimensional flat bands and a number of correlation-induced phases. Currently, the search for kagome systems with a nearly dispersionless flat band close to the Fermi level is ongoing. Here, by combining theoretical and experimental tools, we present Sc${}_3$Mn${}_3$Al${}_7$Si${}_5$ as a novel realization of correlation-induced almost-flat bands in the kagome lattice in the vicinity of the Fermi level. Our magnetic susceptibility, ${}^{27}$Al nuclear magnetic resonance, transport, and optical conductivity measurements provide signatures of a correlated metallic phase with tantalizing ferromagnetic instability. Our dynamical mean-field calculations suggest that such ferromagnetic instability observed originates from the formation of nearly flat dispersions close to the Fermi level, where electron correlations induce strong orbital-selective renormalization and manifestation of the kagome-frustrated bands. In addition, a significant negative magnetoresistance signal is observed, which can be attributed to the suppression of flat-band-induced ferromagnetic fluctuation, which further supports the formation of flat bands in this compound. These findings broaden a new prospect to harness correlated topological phases via multiorbital correlations in 3$d$-based kagome systems.

arXiv comment14 pages, 7 figures

References in corpus (59)

• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• High temperature fractional quantum Hall states
• Fractionalized excitations in the spin liquid state of a kagomé lattice antiferromagnet
• Fractional quantum Hall states at zero magnetic field
• Massive Dirac fermions in a ferromagnetic kagome metal
• Nearly-flat bands with nontrivial topology
• Strong electronic correlations from Hund's coupling
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Dirac fermions and flat bands in the ideal kagome metal FeSn
• Observation of a localized flat-band state in a photonic Lieb lattice
• Dynamical Mean-Field Theory within the Full-Potential Methods: Electronic structure of Ce-115 materials
• Topological insulator on the kagome lattice
• Flat bands and Wigner crystallization in the honeycomb optical lattice
• Fractional Chern insulators in magic-angle twisted bilayer graphene
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Topological flat bands in frustrated kagome lattice CoSn
• Experimental realization and characterization of an electronic Lieb lattice
• Band touching from real space topology in frustrated hopping models
• Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet
• Nodal surface semimetals: Theory and material realization
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Orbital-Selective Mott transition out of band degeneracy lifting
• Exact double-counting in combining the Dynamical Mean Field Theory and the Density Functional Theory
• Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
• Quantum phases driven by strong correlations
• Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
• Strange metal behavior in a pure ferromagnetic Kondo lattice
• Weyl-Kondo Semimetal in Heavy Fermion Systems
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Unconventional Flatband Line States in Photonic Lieb Lattices
• Bloch Model Wavefunctions and Pseudopotentials for All Fractional Chern Insulators
• Flat bands, strange metals, and the Kondo effect
• Topological states on the breathing kagome lattice
• Fantastic flat bands and where to find them: The CoSn-type compounds
• Hundness versus Mottness in a three-band Hubbard-Hund model: On the origin of strong correlations in Hund metals
• Orbital selective Fermi surface shifts and mechanism of high T${}_c$ superconductivity in correlated AFeAs (A=Li,Na)
• Signatures of Mottness and Hundness in archetypal correlated metals
• Slave Boson Theory of Orbital Differentiation with Crystal Field Effects: Application to UO${}_2$
• Spin excitations in metallic kagome lattice FeSn and CoSn
• Non-Thermal Emergence of an Orbital-Selective Mott Phase in FeTe${}_{1-x}$Se${}_x$
• Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$
• Anisotropic c-f hybridization in the ferromagnetic quantum critical metal CeRh${}_6$Ge${}_4$
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Damped Dirac magnon in a metallic kagome antiferromagnet FeSn
• Coupled topological flat and wide bands: Quasiparticle formation and destruction
• Hall coefficient signals orbital differentiation in the Hund's metal Sr${}_2$RuO${}_4$
• An electron correlation originated negative magnetoresistance in a system having a partly flat band
• Emergent flat band and topological Kondo semimetal driven by orbital-selective correlations
• Evidence of orbit-selective electronic kagome lattice with planar flat-band in correlated paramagnetic YCr6Ge6
• Molecular Mott state in the deficient spinel GaV${}_4$S${}_8$
• Orbital-selective Mott phase and non-Fermi liquid in FePS${}_3$
• Neutron scattering study of the kagome metal Sc3Mn3Al7Si5
• Comment on ``Spin Dependent Hopping and Colossal Negative Magnetoresistance in Epitaxial $N{d}_{0.52}S{r}_{0.48}Mn{O}_3$ Films in Fields up to 50 T''

Cited by in corpus (9)

• Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor
• LiV2O4: Hund-Assisted Orbital-Selective Mottness
• Experimental realization of dice-lattice flat band at the Fermi level in layered electride YCl
• Hund flat band in a frustrated spinel oxide
• Observation of Resonance of Kagome Flat Band Doublet
• Coexisting Kagome and Heavy Fermion Flat Bands in YbCr${}_6$Ge${}_6$
• Exploring strong electronic correlations in the breathing kagome metal Fe${}_3$Sn
• Slow ferromagnetic fluctuations in the kagome metal Sc${}_3$Mn${}_3$Al${}_7$Si${}_5$ revealed by ${}^{27}$Al NMR
• Emergent Spin-Singlet Pairing in the Frustrated Kagome Metal Sc${}_3$Mn${}_3$Al${}_7$Si${}_5$