20.500.12556/RUL-158315 Double helix of icosahedra structure and spin glass magnetism of the $\delta$-${\rm Co}_{2.5}{\rm Zn}_{17.5–x}{\rm Mn}_x (x = 0.4–3.5)$ pseudo-binary alloys We have synthesized $\delta$-${\rm Co}_{2.5}{\rm Zn}_{17.5–x}{\rm Mn}_x (x = 0.4–3.5)$ pseudo-binary alloys of 10 different compositions by a high-temperature solid-state synthetic route, determined their crystal structures and the Mn substitution pattern, and estimated the existence range of the $\delta$-phase. The alloys crystallize in two chiral enantiomorphic space groups $P6_2$ and $P6_4$, where the basic atomic polyhedron of the chiral structure is an icosahedron and the neighboring icosahedra share vertices to form an infinitely long double helix along the hexagonal axis (like in the $\delta$-${\rm Co}_{2.5}{\rm Zn}_{17.5}$ parent binary phase). The alloys are pure $\delta$-phase up to the ${\rm Mn}$ content $x \approx 3.5$. The ${\rm Mn}$ atoms partially substitute ${\rm Zn}$ atoms at particular crystallographic sites located on the icosahedra. The study of magnetism was performed on the ${\rm Co}_{2.5}{\rm Zn}_{17.1}{\rm Mn}_{0.4}$ alloy with the lowest ${\rm Mn}$ content. Contrary to the expectation that structural chirality may induce the formation of a nontrivial magnetic state, a spin glass state with no relation to the structural chirality was found. The magnetic sublattice contains all of the necessary ingredients (randomness and frustration) for the formation of a spin glass state. Typical out-of-equilibrium dynamic phenomena of a spin system with broken ergodicity were detected below the spin freezing temperature $T_f \approx 8$ K. chemical structure crystal structure nucleic acid structure quantum mechanics transition metals zlitine kristalna struktura kemična sestava nukleinske kisline true false true Angleški jezik Slovenski jezik Članek v reviji 2024-06-05 08:48:52 2024-06-05 08:48:54 2024-06-26 03:38:56 0000-00-00 00:00:00 2024 0 0 Str. 10251–10263 iss. 22 Vol. 63 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 546 1520-510X 10.1021/acs.inorgchem.4c00686 196165379 mondal-et-al-2024-double-helix-of-icosahedra-structure-and-spin-glass-magnetism-of-the-δ-co2-5zn17-5-xmnx-(x-0-4-3-5).pdf mondal-et-al-2024-double-helix-of-icosahedra-structure-and-spin-glass-magnetism-of-the-δ-co2-5zn17-5-xmnx-(x-0-4-3-5).pdf 1 9D261E901000C422C308A68D6F76C67B afb3dbf1eec74f365a9193dc563d79d840f0b42d6985e76eb85e3739308fe98a a6972a73-2343-11ef-b111-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=185907 https://pubs.acs.org/doi/10.1021/acs.inorgchem.4c00686 1 ac804d57-2307-11ef-b111-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=185875 Fakulteta za matematiko in fiziko Fakulteta za gradbeništvo in geodezijo Fakulteta za kemijo in kemijsko tehnologijo 0 0 0