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- W2051489715 abstract "The in-plane ferromagnetic (FM) fluctuations and three-dimensional (3D) itinerant magnetism on the 3D triangular lattice of NaxCoO2 are studied based on a single-band Hubbard model using the Kotliar–Ruckenstein (KR) slave-boson mean-field (SBMF) technique. By analyzing the instabilities of the FM and layer-type antiferromagnetic (AFM) susceptibilities, the in-plane FM fluctuations in NaxCoO2 with x < 0.63 are identified as the effects of both the strong Coulomb repulsion and the frustration on the Co ion triangular lattice. The saddle-point solutions suggest that the experimental layer-type AFM state is favorable for x > 0.75 due to the band top edge van Hove singularity arising from the next-nearest-neighbor (NNN) hopping. We also discuss the potential connection between the Curie–Weiss metallic behavior and the crossover from the weak FM phase to the layer-type AFM phase at 0.63 < x < 0.75. Our results reveal the crucial role of the modified effects of the Coulomb interactions with doping x." @default.
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- W2051489715 date "2012-01-25" @default.
- W2051489715 modified "2023-09-25" @default.
- W2051489715 title "Spin fluctuations and 3D itinerant magnetism in Na x CoO2 : Slave-boson mean-field study" @default.
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- W2051489715 doi "https://doi.org/10.1002/pssb.201147435" @default.
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