Neutron scattering study of novel magnetic order in Na0.5CoO2

Abstract

We report polarized and unpolarized neutron scattering measurements of the magnetic order in single crystals of Na0.5CoO2. Our data indicate that below T_N=88 K the spins form a novel antiferromagnetic pattern within the CoO2 planes, consisting of alternating rows of ordered and non-ordered Co ions. The domains of magnetic order are closely coupled to the domains of Na ion order, consistent with such a two-fold symmetric spin arrangement. Magnetoresistance and anisotropic susceptibility measurements further support this model for the electronic ground state.

4 pages, 4 figures

References in corpus (11)

• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
• Charge-ordering, commensurability and metallicity in the phase diagram of layered Na(x)CoO(2)
• Low temperature phase transitions and crystal structure of Na0.5CoO2
• Thermodynamic and Transport Measurements on Superconducting Na_xCoO_2 + yH_2O Single Crystals Prepared by Electrochemical De-intercalation
• Magnetic Correlation of NaxCoO2 and Successive Phase Transitions of Na0.5CoO2 -NMR and Neutron Diffraction Studies-
• Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study
• Infrared spectroscopy of the charge ordering transition in Na${}_{0.5}$CoO${}_2$
• Magnetic susceptibility study of hydrated and non-hydrated NaxCoO2-yH2O single crystals
• Disproportionation Transition at Critical Interaction Strength: Na${}_{1/2}$CoO${}_2$
• The infrared conductivity of Na${}_x$CoO${}_2$: evidence of gapped states
• Electrochemical De-intercalation, Oxygen Non-stoichiometry, and Crystal Growth of NaxCoO2-d

Cited by in corpus (33)

• Ferromagnetism, paramagnetism and a Curie-Weiss metal in an electron doped Hubbard model on a triangular lattice
• Searching for Stable Na-ordered Phases in Single Crystal Samples of gamma-NaxCoO2
• Na atomic order, Co charge disproportionation and magnetism in Na${}_x$CoO${}_2$ for large Na contents
• Magnetic and Electronic Properties of Li${}_x$CoO${}_2$ Single Crystals
• Phase Diagram of Na${}_x$CoO${}_2$ Studied by Gutzwiller Density Functional Theory
• Competing orders in Na${}_x$CoO${}_2$ from strong correlations on a two-particle level
• Charge and spin order on the triangular lattice -- Na${}_x$CoO${}_2$ at $x=0.5$
• Shubnikov de Haas effect in the metallic state of Na${}_{0.3}$CoO${}_2$
• ^{59}Co NMR evidence for charge ordering below T_{CO}\sim 51 K in Na_{0.5}CoO_2
• Precise Control of Band Filling in NaxCoO2
• Squaring the Triangle: Insulating Ground State of $N{a}_{0.5}Co{O}_2$
• Charge and Spin Ordering in Insulating Na${}_{0.5}$CoO${}_2$: Effects of Correlation and Symmetry
• The origin of strong correlations and superconductivity in Na${}_x$CoO${}_2$
• Electronic phase diagram of LixCoO2 revisited with potentiostatically de-intercalated single crystals
• Itinerant and localized magnetism on the triangular lattice: sodium rich phases of Na${}_x$CoO${}_2$
• In-plane ferromagnetism in charge-ordering $N{a}_{0.55}Co{O}_2$
• Interplay of frustration, magnetism, charge ordering, and covalency in a model of Na0.5CoO2
• Novel electronic states realized by the interplay between Li diffusion and Co${}^{3+}$$/$Co${}^{4+}$ charge ordering in Li${}_{\mathrm{x}}$CoO${}_2$
• Search for Magnetic Excitation Spectra of NaxCoO2.yD2O -Neutron Scattering-
• Anisotropic Magnetoresistance in Charge-Ordering $N{a}_{0.34}(H_{3}O{)}_{0.15}Co{O}_2$:Strong Spin-Charge Coupling and Spin Ordering
• Emergent charge ordering in near half doped Na${}_{0.46}$CoO${}_2$
• 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
• Chemical Differences between K and Na in Alkali Cobaltates
• Electronic and magnetic properties of the ionic Hubbard model on the striped triangular lattice at 3/4 filling
• NMR studies of Successive Phase Transitions in Na0.5CoO2 and K0.5CoO2
• Phonon softening and "forbidden" mode observed by Raman scattering in Na0.5CoO2
• Angular-dependent Magnetoresistance Oscillations in Na${}_{0.48}$CoO${}_2$ Single Crystal
• Magnetic field induced spin-flop transition in Na${}_x$CoO${}_2$ (0.5$<$x$<$0.55)
• Hall effect evidence for an interplay between electronic correlations and Na order induced electronic bands topology in NaxCoO2
• A possibility of high spin hole states in doped CoO${}_2$ layered systems
• Magnetotransport properties in purple bronze Li${}_{0.9}$Mo${}_6$O${}_{17}$ Single Crystal
• Itinerant magnetism in the triangular lattice Hubbard model at half-doping: Application to twisted transition-metal dichalcogenides
• Temperature-driven sodium-ion dynamical-to-static crossover in the zig-zag ordered phase of Na${}_{0.5}$CoO${}_2$