Low energy electronic states and triplet pairing in layered cobaltates

Abstract

The structure of the low-energy electronic states in layered cobaltates is considered starting from the Mott insulating limit. We argue that the coherent part of the wave-functions and the Fermi-surface topology at low doping are strongly influenced by spin-orbit coupling of the correlated electrons on the $t_{2g}$ level. An effective t-J model based on mixed spin-orbital states is radically different from that for the cuprates, and supports unconventional, pseudospin-triplet pairing.

arXiv comment4 pages, 3 figures

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• Excitonic Magnetism in Van Vleck-type d^4 Mott Insulators
• Hidden symmetries of the extended Kitaev-Heisenberg model: Implications for honeycomb lattice iridates A2IrO3
• The Challenge of Spin-Orbit-Tuned Ground States in Iridates
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• Magnetic anisotropy in the Kitaev model systems Na2IrO3 and RuCl3
• Magnetic couplings, optical spectra, and spin-orbit exciton in 5d electron Mott insulator Sr2IrO4
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• Competition between d-wave and topological p-wave superconductivity in the doped Kitaev-Heisenberg model
• Frustration and entanglement in the $t_{2g}$ spin--orbital model on a triangular lattice: valence--bond and generalized liquid states
• Global phase diagram, possible chiral spin liquid and topological superconductivity in the triangular Kitaev-Heisenberg model
• Observation of spin-orbit excitations and Hund's multiplets in Ca${}_2$RuO${}_4$
• Na content dependence of superconductivity and the spin correlations in Na_{x}CoO_{2}\cdot 1.3H_{2}O
• Possible Spin-triplet Superconductivity in NaxCoO2yH2O - 59Co NMR Study
• Towards Kitaev Spin Liquid in 3d Transition Metal Compounds
• Spin-orbital resonating valence bond liquid on a triangular lattice: Evidence from finite-cluster diagonalization
• Resonant inelastic x-ray scattering operators for $t_{2g}$ orbital systems
• Shubnikov de Haas effect in the metallic state of Na${}_{0.3}$CoO${}_2$
• Hidden Quasiparticles and Incoherent Photoemission Spectra in Na2IrO3
• Polarization dependence of x-ray absorption spectra in Na_xCoO_2
• A $j_{\mathrm{eff}}=1/2$ Kitaev material on the triangular lattice: The case of NaRuO${}_2$
• Anisotropic Behavior of Knight Shift in Superconducting State of Na_xCoO_2yH_2O
• Exchange interactions in $d^5$ Kitaev materials: From Na${}_2$IrO${}_3$ to $\alpha$-RuCl${}_3$
• A computational method to estimate spin-orbital interaction strength in solid state systems
• Na${}_x$CoO${}_2$ in the x -> 0 Regime: Coupling of Structure and Correlation effects
• Effective Hamiltonian for transition-metal compounds. Application to Na_xCoO_2
• Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O I: d-vector under zero magnetic field
• Novel phase diagram of superconductor NaxCoO2-yH2O in a 75 % relative humidity
• Magnetic Fluctuations and the Spin-Orbit Interaction in Mott Insulating CoO
• Non-monotonic temperature dependence of thermopower in strongly correlated electron systems
• Orbital Symmetry and Orbital Excitations in High-$T_c$ Superconductors
• Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O II: Multiple phase diagram under the magnetic field
• Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates
• Topological superconductivity from doping a triplet quantum spin liquid in a flat band system
• Spin disorder in an Ising honeycomb chain cobaltate
• Emergence of bond-dependent highly anisotropic magnetic interactions in Sr${}_4$RhO${}_6$: a theoretical study
• A possibility of high spin hole states in doped CoO${}_2$ layered systems
• Searching for superconductivity in doped triangular lattice Kitaev magnets
• In-plane Anisotropy of the Magnetic Fluctuations in NaxCoO2-yH2O