Coupled spin-charge order in frustrated itinerant triangular magnets

Abstract

We uncover four new spin-charge ordered ground states in the strong coupling limit of the Kondo lattice model on triangular geometry. Two of the states at one-third electronic filling ($n=1/3$) consist of decorated ferromagnetic chains coupled antiferromagnetically with the neighboring chains. The third magnetic ground state is noncollinear, consisting of antiferromagnetic chains separated by a pair of canted ferromagnetic chains. An even more unusual magnetic ground state, a variant of the $120^{\circ }$ Yafet-Kittel phase, is discovered at $n=2/3$. These magnetic orders are stabilized by opening a gap in the electronic spectrum: a "band effect". All the phases support modulations in the electronic charge density due to the presence of magnetically inequivalent sites. In particular, the charge ordering pattern found at $n=2/3$ is observed in various triangular lattice systems, such as, 2H-AgNiO${}_2$, 3R-AgNiO${}_2$ and Na${}_x$CoO${}_2$.

5 pages, 4 figures

References in corpus (29)

• Anomalous Hall effect
• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Dilute ferromagnetic semiconductors: Physics and spintronic structures
• Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
• Colloquium: Artificial spin ice: Designing and imaging magnetic frustration
• Phase Separation in Electronic Models for Manganites
• Scalar spin chirality and quantum Hall effect on a triangular lattice
• Hidden Multiple-spin Interactions as an Origin of Spin Scalar Chiral Order in Frustrated Kondo Lattice Models
• Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO_3/SrTiO_3 interface
• Ab-initio calculation of the electronic and optical excitations in polythiophene: effects of intra- and interchain screening
• Electronic Hamiltonian for Transition Metal Oxide Compounds
• Multiple-Q Instability by (d-2)-dimensional Connections of Fermi Surfaces
• Dirac half-metal in a triangular ferrimagnet
• Charge ordering and magneto-polarons in Na${}_{0.82}$CoO${}_2$
• Frustration-induced insulating chiral spin state in itinerant triangular-lattice magnets
• Orbital degeneracy removed by charge order in triangular antiferromagnet AgNiO2
• Exact many-electron ground states on the diamond Hubbard chain
• Noncoplanar magnetic ordering driven by itinerant electrons on the pyrochlore lattice
• Route to ferromagnetism in organic polymers
• Switchable Quantum Anomalous Hall state in a strongly frustrated lattice magnet
• Absence of spontaneous magnetic order of lattice spins coupled to itinerant interacting electrons in one and two dimensions
• Charge disproportionation and collinear magnetic order in the frustrated triangular antiferromagnet AgNiO2
• Phase competition in the double-exchange model on the frustrated pyrochlore lattice
• Charge Order in a Two-Dimensional Kondo Lattice Model
• Charge ordering and magnetism in quarter-filled Hubbard-Holstein model
• Na order and Co charge disproportionation in Na${}_x$CoO${}_2$
• Thermally-induced Phases in an Ising Kondo Lattice Model on a Triangular Lattice: Partial Disorder and Kosterlitz-Thouless State
• Magnetic phase diagram of the Kondo lattice model with quantum localized spins
• Complex magnetic differentiation of cobalts in Na${}_x$CoO${}_2$ with 22K Néel temperature

Cited by in corpus (9)

• Topological spin crystals by itinerant frustration
• Vortices, skyrmions, and chirality waves in frustrated Mott insulators with a quenched periodic array of impurities
• Skyrmion Crystals in the Triangular Kondo Lattice Model
• Noncollinear and noncoplanar magnetic order in the extended Hubbard model on anisotropic triangular lattice
• Emergent lattices with geometrical frustration in doped extended Hubbard models
• A strong coupling theory for electron-mediated interactions in double-exchange models
• Electronic route to stabilize nanoscale spin textures in itinerant frustrated magnets
• Topological Hall effect in the Shastry-Sutherland lattice
• Spin nematic order and superconductivity in $J_1$-$J_2$ Kondo lattice model on square lattice