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- W4309470003 abstract "We report crystal structure, magnetization, and specific heat measurements on single crystals of the hexagonal polar magnet ${mathrm{Co}}_{2text{ensuremath{-}}x}{mathrm{Zn}}_{x}{mathrm{Mo}}_{3}{mathrm{O}}_{8}$ magnetically diluted by replacing Co by Zn. In contrast to the transformation from the antiferromagnetic to a ferrimagnetic state observed in the isostructural ${mathrm{Fe}}_{2}{mathrm{Mo}}_{3}{mathrm{O}}_{8}$ upon small Zn doping, a robust antiferromagnetic behavior is preserved in Zn-doped ${mathrm{Co}}_{2}{mathrm{Mo}}_{3}{mathrm{O}}_{8}$ up to $x=0.55$. The N'eel temperature decreases from ${T}_{mathrm{N}}=40$ K at $x=0$ to 23 K at $x=0.55$, thus extrapolating to $x=1.27$ (36% filling) as the percolation threshold typical for a three-dimensional, highly coordinated network. This indicates strong magnetic couplings beyond the honeycomb planes in ${mathrm{Co}}_{2}{mathrm{Mo}}_{3}{mathrm{O}}_{8}$. A sharp peak in the specific heat and a clear cusp in the susceptibility associated with the onset of magnetic order is observed up to $x=0.55$, whereas at $x=0.66$ these features are broadened due to increased disorder. Interestingly, the in-plane lattice parameter, the Curie-Weiss temperature, and the magnetic entropy vary with $x$ in a concerted but nonmonotonic manner. These observations can be traced back to the observed site-selective Zn substitution. We found that in the low-doping regime ($x<0.2$) ${mathrm{Zn}}^{2+}$ ions primarily occupy the octahedrally coordinated sites, although they have a clear preference for occupying the tetrahedrally coordinated sites at higher doping levels. Due to the multiple interlayer exchange paths, dependent on the coordination of the ${mathrm{Co}}^{2+}$ ions, this behavior is reflected in the nonmonotonic variation of the Curie-Weiss temperature and magnetic entropy with substitution." @default.
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- W4309470003 date "2022-11-18" @default.
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- W4309470003 title "Dilution of a polar magnet: Structure and magnetism of Zn-substituted <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Mo</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W4309470003 doi "https://doi.org/10.1103/physrevb.106.174421" @default.
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