Direct link between low temperature magnetism and high temperature sodium order in NaxCoO2

Abstract

We prove the direct link between low temperature magnetism and high temperature sodium ordering in NaxCoO2 using the example of a heretofore unreported magnetic transition at 8 K which involves a weak ferromagnetic moment. The 8 K feature is characterized in detail and its dependence on a diffusive sodium rearrangement around 200 K is demonstrated. Applying muons as local probes this process is shown to result in a reversible phase separation into distinct magnetic phases that can be controlled by specific cooling protocols. Thus the impact of ordered sodium Coulomb potential on the CoO2 physics is evidenced opening new ways to experimentally revisit the NaxCoO2 phase diagram.

4 pages, 4 figures, to appear in PRL

References in corpus (19)

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• Large enhancement of the thermopower in Na${}_x$CoO${}_2$ at high Na doping
• Patterning of sodium ions and the control of electrons in sodium cobaltate
• Unconventional magnetic transition and transport behavior in Na0.75CoO2
• Coupling between electronic and structural degrees of freedom in the triangular lattice conductor NaxCoO2
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• Theory of Sodium Ordering in NaxCoO2
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• 59Co NMR study of the Co states in superconducting and anhydrous cobaltates
• Metamagnetic Transition in Na${}_{0.85}$CoO${}_2$ Single Crystals
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• Non-magnetic insulator state in Na1CoO2 and phase separation of Na vacancies
• Investigation of the Spin Density Wave in NaxCoO2
• Precise Control of Band Filling in NaxCoO2
• Synthesis, Characterization, and Magnetic Properties of gamma-NaxCoO2 (0.70 < x <0.84)
• Spin gaps and magnetic structure of NaxCoO2
• Stripe correlations in Na${}_{0.75}$CoO${}_2$

Cited by in corpus (20)

• 1D to 2D Na Ion Diffusion Inherently Linked to Structural Transitions in Na${}_{0.7}$CoO${}_2$
• Electronic texture of the thermoelectric oxide Na0.75CoO2
• NQR and X-ray investigation of the structure of Na${}_{2/3}$CoO${}_2$ compound
• Discontinuous Lifshitz Transition Achieved by Band-Filling Control in NaxCoO2
• Sodium layer chiral distribution and spin structure of Na${}_2$Ni${}_2$TeO${}_6$ with a honeycomb network
• Melting of the Na layers in solid Na0.8CoO2
• Revealing the ortho-II Band Folding in YBa2Cu3O7-delta Films
• Magnetism and Ion Diffusion in Honeycomb Layered Oxide K${}_2$Ni${}_2$TeO${}_6$: First Time Study by Muon Spin Rotation & Neutron Scattering
• Crystal-to-stripe reordering of sodium ions in NaxCoO2 (x>=0.75)
• 23Na NMR study of sodium order in NaxCoO2 with 22K Neel temperature
• Rearrangement of Sodium ordering and its effect on physical properties in $N{a}_{x}Co{O}_2$ system
• Spin fluctuations, magnetic long-range order and Fermi surface gapping in NaxCoO2
• Novel electronic states realized by the interplay between Li diffusion and Co${}^{3+}$$/$Co${}^{4+}$ charge ordering in Li${}_{\mathrm{x}}$CoO${}_2$
• Na-ion dynamics in Quasi-1D compound NaV2O4
• The Duel of Magnetic Interactions & Structural Instabilities: Itinerant Frustration in the Triangular Lattice Compound LiCrSe${}_2$
• Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe${}_2$ investigated by ${\mu }^{+}$SR as well as neutron and X-ray diffraction
• 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
• Ferrimagnetic ordering and spin entropy of field-dependent intermediate spins in Na0.82CoO2
• Interplay between magnetism and sodium vacancy ordering in NaxCoO2
• One-particle spectral properties of the t-J-$V$ model on the triangular lattice near charge order