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SM ISO690:2012 PRODAN, Lilian, FILIPPOVA, Irina, ZUBTSOVSKII, Alexander O., SHOVA, Sergiu, WIDMANN, S., TSIRLIN, Alexander A., KEZSMARKI, Istvan, TSURKAN, Vladimir. Dilution of a polar magnet: Structure and magnetism of Zn-substituted Co2Mo3 O8. In: Physical Review B, 2022, vol. 106, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.106.174421 |
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Physical Review B | ||||||
Volumul 106 / 2022 / ISSN 2469-9950 /ISSNe 2469-9969 | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.106.174421 | ||||||
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We report crystal structure, magnetization, and specific heat measurements on single crystals of the hexagonal polar magnet Co2-xZnxMo3O8 magnetically diluted by replacing Co by Zn. In contrast to the transformation from the antiferromagnetic to a ferrimagnetic state observed in the isostructural Fe2Mo3O8 upon small Zn doping, a robust antiferromagnetic behavior is preserved in Zn-doped Co2Mo3O8 up to x=0.55. The Néel temperature decreases from TN=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 Co2Mo3O8. 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) Zn2+ 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 Co2+ ions, this behavior is reflected in the nonmonotonic variation of the Curie-Weiss temperature and magnetic entropy with substitution. |
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Cuvinte-cheie Antiferromagnetism, Binary alloys, crystal structure, entropy, Magnetic couplings, Magnets, single crystals, specific heat, Zinc |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Prodan, L.I.</dc:creator> <dc:creator>Filippova, I.G.</dc:creator> <dc:creator>Zubtsovskii, A.</dc:creator> <dc:creator>Şova, S.G.</dc:creator> <dc:creator>Widmann, S.</dc:creator> <dc:creator>Tsirlin, A.</dc:creator> <dc:creator>Kezsmarki, I.</dc:creator> <dc:creator>Ţurcan, V.V.</dc:creator> <dc:date>2022-11-01</dc:date> <dc:description xml:lang='en'><p>We report crystal structure, magnetization, and specific heat measurements on single crystals of the hexagonal polar magnet Co2-xZnxMo3O8 magnetically diluted by replacing Co by Zn. In contrast to the transformation from the antiferromagnetic to a ferrimagnetic state observed in the isostructural Fe2Mo3O8 upon small Zn doping, a robust antiferromagnetic behavior is preserved in Zn-doped Co2Mo3O8 up to x=0.55. The Néel temperature decreases from TN=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 Co2Mo3O8. 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) Zn2+ 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 Co2+ ions, this behavior is reflected in the nonmonotonic variation of the Curie-Weiss temperature and magnetic entropy with substitution.</p></dc:description> <dc:identifier>10.1103/PhysRevB.106.174421</dc:identifier> <dc:source>Physical Review B () 0-0</dc:source> <dc:subject>Antiferromagnetism</dc:subject> <dc:subject>Binary alloys</dc:subject> <dc:subject>crystal structure</dc:subject> <dc:subject>entropy</dc:subject> <dc:subject>Magnetic couplings</dc:subject> <dc:subject>Magnets</dc:subject> <dc:subject>single crystals</dc:subject> <dc:subject>specific heat</dc:subject> <dc:subject>Zinc</dc:subject> <dc:title>Dilution of a polar magnet: Structure and magnetism of Zn-substituted Co2Mo3 O8</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>