Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy

Abstract

We present an angle-resolved photoemission study of Na0.7CoO2, the host cobaltate of the NaxCoO2.yH2O series. Our results show a large hexagonal-like hole-type Fermi surface, an extremely narrow strongly renormalized quasiparticle band and a small Fermi velocity. Along the Gamma to M high symmetry line, the quasiparticle band crosses the Fermi level from M toward Gamma consistent with a negative sign of effective single-particle hopping (t ): t is estimated to be about 8 meV which is on the order of exchange coupling J in this system. This suggests that t ~ J ~ 10 meV is an important energy scale in the system. Quasiparticles are well defined only in the T-linear resistivity regime. Small single particle hopping and unconventional quasiparticle dynamics may have implications for understanding the unusual behavior of this new class of compounds.

Revised text, Added Figs, Submitted to PRL

References in corpus (11)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
• Superconductivity Phase Diagram of Na(x)CoO(2).1.3H(2)O
• Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering
• Unconventional magnetic transition and transport behavior in Na0.75CoO2
• Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides
• Coherence-Incoherence and Dimensional Crossover in Layered Strongly Correlated Metals
• Specific-heat evidence for strong electron correlations in the thermoelectric material (Na,Ca)Co_{2}O_{4}
• Structure and Dynamics of Superconducting NaxCoO(2) Hydrate and Its Unhydrated Analog
• Chemical Instability of the Cobalt Oxyhydrate Superconductor under Ambient Conditions
• Momentum-Resolved Charge Excitations in a Prototype One Dimensional Mott Insulator

Cited by in corpus (125)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• "Pudding mold" band drives large thermopower in Na${}_x$CoO${}_2$
• Patterning of sodium ions and the control of electrons in sodium cobaltate
• Fermi surface evolution and Luttinger theorem in Na${}_x$CoO${}_2$: a systematic photoemission study
• ARPES on Na${}_{0.6}$CoO${}_2$: Fermi surface, extended flat dispersion, and unusual band splitting
• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
• Direct measurement of quantum phases in graphene via photoemission spectroscopy
• Temperature and bath size in exact diagonalization dynamical mean field theory
• Ferromagnetism, paramagnetism and a Curie-Weiss metal in an electron doped Hubbard model on a triangular lattice
• Anisotropic chiral d+id superconductivity in NaxCoO2 yH2O
• Electron correlation and Fermi surface topology of Na${}_x$CoO${}_2$
• Possible spin-triplet $f$-wave pairing due to disconnected Fermi surfaces in Na${}_x$CoO${}_2\cdot y$H${}_2$O
• Non-generality of the Kadowaki-Woods ratio in correlated oxides
• Nesting, spin-fluctuations, and odd-gap superconductivity in NaxCoO2 yH2O
• Charge ordering and magneto-polarons in Na${}_{0.82}$CoO${}_2$
• Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors (NaxCoO2)
• Orbital Symmetry and Electron Correlation in Na_{x}CoO_2
• The crucial importance of the $t_{2g}$--$e_g$ hybridization in transition metal oxides
• Complete d-Band Dispersion and the Mobile Fermion Scale in NaxCoO2
• The Fermi surface of Na${}_x$CoO${}_2$
• Multi-orbital analysis on the Superconductivity in Na_{x}CoO_{2} \cdot y H_{2}O
• Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2
• Searching for Stable Na-ordered Phases in Single Crystal Samples of gamma-NaxCoO2
• Quasiparticle coherence and the nature of the metal-insulator phase transition in Na${}_x$CoO${}_2$
• Angle-resolved photoemission study of cobalt oxide superconductor NaxCoO2.yH2O : Observation of the Fermi surface
• Low energy electronic states and triplet pairing in layered cobaltates
• Fermi surface and quasiparticle excitations of Sr${}_2$RhO${}_4$
• Infrared spectroscopy of the charge ordering transition in Na${}_{0.5}$CoO${}_2$
• Weak Magnetic Order in the Bilayered-hydrate Na${}_x$CoO${}_2\cdot y$H${}_2$O Structure Probed by Co Nuclear Quadrupole Resonance - Proposed Phase Diagram in Superconducting Na${}_x$CoO${}_2\cdot$ $y$H${}_2$O
• Infrared probe of the electronic structure and charge dynamics in Na${}_{0.7}$CoO${}_2$
• Exact Diagonalization Dynamical Mean Field Theory for Multi-Band Materials: Effect of Coulomb correlations on the Fermi surface of Na_0.3CoO_2
• Spin correlations and cobalt charge states: A new phase diagram of sodium cobaltates
• Nodal $d+id$ pairing and topological phases on the triangular lattice: unconventional superconducting state of Na${}_x$CoO${}_2\cdot y$H${}_2$O
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3
• Competition between singlet and triplet pairings in Na_xCoO_2 yH_2O
• Anomalous electronic Raman scattering in Na_xCoO_2 H_2O
• Strong Correlations Produce the Curie-Weiss Phase of Na${}_x$CoO${}_2$
• Destruction of the small Fermi surfaces in Na${}_x$CoO${}_2$ by Na disorder
• Anisotropic quasiparticle renormalization in Na0.73CoO2: role of inter-orbital interactions and magnetic correlations
• Phase Diagram of Na${}_x$CoO${}_2$ Studied by Gutzwiller Density Functional Theory
• Enhancement of the Na${}_x$CoO${}_2$ thermopower due to electronic correlations
• Competing orders in Na${}_x$CoO${}_2$ from strong correlations on a two-particle level
• Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides
• Half-metallic Surface States and Topological Superconductivity in NaCoO${}_2$ from first principles
• Local moment, itinerancy and deviation from Fermi liquid behavior in Na${}_x$CoO${}_2$ for $0.71\le x\le 0.84$
• Magnetic properties of spin-orbital polarons in lightly doped cobaltates
• Mottness on a triangular lattice
• Charge and spin order on the triangular lattice -- Na${}_x$CoO${}_2$ at $x=0.5$
• Ferromagnetic and triplet-pairing instabilities controlled by the trigonal distortion of the CoO_6 octahedra in Na_xCoO_2*yH_2O
• Shubnikov de Haas effect in the metallic state of Na${}_{0.3}$CoO${}_2$
• Precise Control of Band Filling in NaxCoO2
• Itinerant in-plane magnetic fluctuations and many-body correlations in Na${}_x$CoO${}_2$
• Laser-excited ultrahigh-resolution photoemission spectroscopy of NaxCoO2.yH2O:Evidence for pseudogap formation
• Hallmark of strong electronic correlations in LaNiO${}_3$: photoemission kink and broadening of fully occupied bands
• A Tight-Binding Investigation of the NaxCoO2 Fermi Surface
• Polarization dependence of x-ray absorption spectra in Na_xCoO_2
• Efficient fluctuation exchange approach to low-temperature spin fluctuations and superconductivity: from the Hubbard model to Na${}_x$CoO${}_2\cdot y$H${}_2$O
• Transport properties of the layered Rh oxide K_0.49RhO_2
• 17-O NMR studies of a triangular-lattice superconductor Na{x}CoO{2}yH{2}O
• A unified origin for the 3D magnetism and superconductivity in Na${}_x$CoO${}_2$
• Squaring the Triangle: Insulating Ground State of $N{a}_{0.5}Co{O}_2$
• Optical Properties and Correlation Effects in NaxCoO2
• Temperature Dependence of the Chemical Potential in NaxCoO2: Implications for the Large Thermoelectric Power
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Electron-boson mode coupling and the pseudogap of Na${}_x$CoO${}_2$ by infrared spectroscopy
• Thermoelectric effects in a strongly correlated model for Na${}_x$CoO${}_2$
• Orbitally relieved magnetic frustration in NaVO2
• Thermal and Electrical Properties of gamma-NaxCoO2 (0.70 < x < 0.78)
• Infrared Conductivity and Charge Ordering in NaCoO2
• Experimental study of the incoherent spectral weight in the photoemission spectra of the misfit cobaltate [Bi2Ba2O4][CoO2]2
• Optical Study of the Electronic Structure and Correlation Effects in K0.49RhO2
• Strong correlations enhanced by charge-ordering in highly doped cobaltates
• Coulomb correlations do not fill the e'_g hole pockets in Na_{0.3}CoO_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
• Finite temperature properties of the triangular lattice t-J model, applications to Na${}_x$CoO${}_2$
• Electronic structure and Fermi surface tolopogy of Na${}_x$CoO${}_2$
• Itinerant and localized magnetism on the triangular lattice: sodium rich phases of Na${}_x$CoO${}_2$
• Spin-entropy contribution to thermopower in the [Ca${}_2$CoO${}_{3-t}$]${}_{0.62}$(CoO${}_2$) misfits
• Textured electronic states of the triangular lattice Hubbard model and Na${}_x$CoO${}_2$
• Non-monotonic temperature dependence of thermopower in strongly correlated electron systems
• Getting back to Na_xCoO_2: spectral and thermoelectric properties
• The electronic structure of the Na${}_x$CoO${}_2$ surface
• Dimensional crossover and anomalous magnetoresistivity in single crystals $N{a}_{x}Co{O}_2$
• Optical evidence for the proximity to a spin-density-wave metallic state in Na${}_{0.7}$CoO${}_2$
• Enhanced Seebeck coefficient by a filling-induced Lifshitz transition in KxRhO2
• Considerable non-local electronic correlations in strongly doped Na${}_x$CoO${}_2$
• The origin of a${}_{1g}$ and e${}_g$' orderings in Na${}_x$CoO${}_2$
• Spin fluctuations, magnetic long-range order and Fermi surface gapping in NaxCoO2
• Electron-phonon interaction in the lamellar cobaltate Na${}_x$CoO${}_2$
• Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
• Magnetic Phase Transition at 88 K in Na0.5CoO2 revealed by 23Na-NMR investigations
• Anisotropic Magnetoresistance in Charge-Ordering $N{a}_{0.34}(H_{3}O{)}_{0.15}Co{O}_2$:Strong Spin-Charge Coupling and Spin Ordering
• Search for Magnetic Excitation Spectra of NaxCoO2.yD2O -Neutron Scattering-
• Metal-nonmetal transition in LixCoO2 thin film and thermopower enhancement at high Li concentration
• From Hubbard bands to spin-polaron excitations in the doped Mott material Na${}_x$CoO${}_2$
• Electronic theory for itinerant in-plane magnetic fluctuations in Na${}_x$CoO${}_2$
• Hall effect on the triangular lattice
• Ionic Hubbard model on a triangular lattice for Na_0.5CoO_2, Rb_0.5CoO_2 and K_0.5CoO_2: Mean-field slave boson theory
• Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates
• Theory of carrier concentration-dependent electronic behavior in layered cobaltates
• Transport properties and magnetic field induced localization in the misfit cobaltite [Bi${}_2$Ba${}_{1.3}$K${}_{0.6}$Co${}_{0.1}$]${}^{RS}$[CoO${}_2$]${}_{1.97}$ single crystal
• Dynamical magnetic susceptibility in the lamellar cobaltate superconductor Na_xCoO_2$\cdot y$H_2O
• Origin of the electron disproportionation in the metallic sodium cobaltates
• Is there a common theme behind the correlated-electron superconductivity in organic charge-transfer solids, cobaltates, spinels and fullerides?
• Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
• Hard x-ray spectroscopy in NaxCoO2 and superconducting NaxCoO2 - yH2O: A view on the bulk Co electronic properties
• Role of electronic correlations in the Fermi surface formation of Na${}_x$CoO${}_2$
• Evidence for Oxygen Holes due to d-p Rehybridization in Thermoelectric Sr_{1-x}Rh_{2}O_{4}
• Nature of Correlated Motion of Electrons in the Parent Cobaltate Superconductors
• Band structure renormalization and weak pseudogap behavior in Na_{0.33}CoO_2: Fluctuation exchange study based on a single band model
• Charge order and phonon renormalizations: Possible implications for cobaltates
• ARPES Study of the Metal-Insulator Transition in Bismuth Cobaltates
• Charge ordering in charge-compensated $N{a}_{0.41}Co{O}_2$ by oxonium ions
• One-particle spectral properties of the t-J-$V$ model on the triangular lattice near charge order
• Low-lying electronic structure of doped triangular cobaltates
• Infrared Hall conductivity of Na${}_{0.7}$CoO${}_2$
• Ground state and spectral properties across a Charge Density Wave transition in a triangular-lattice spinless Fermion model
• Evolution of electron Fermi surface with doping in cobaltates
• Ab-initio studying of spin states of sodium cobaltate Na${}_{2/3}$CoO${}_2$
• Anomalous band renormalization due to high energy $kink$ in the colossal thermoelectric material K${}_{0.65}$RhO${}_2$
• Dynamical spin response of electron doped Mott insulators on a triangular lattice
• Statistical fluxes and the Curie-Weiss metal state
• Similarities in electronic properties of organic charge-transfer solids and layered cobaltates
• Itinerant magnetism in the triangular lattice Hubbard model at half-doping: Application to twisted transition-metal dichalcogenides