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

Mondal, Amit (avtor), Koželj, Primož (avtor), Jagličić, Zvonko (avtor), Meden, Anton (avtor), Pratim Jana, Partha (avtor), Dolinšek, Janez (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: chemical structure, crystal structure, nucleic acid structure, quantum mechanics, transition metals
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko ; FGG - Fakulteta za gradbeništvo in geodezijo ; FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: Str. 10251–10263
• Številčenje: Vol. 63, iss. 22
• PID: 20.500.12556/RUL-158315
• UDK: 546
• ISSN pri članku: 1520-510X
• DOI: 10.1021/acs.inorgchem.4c00686
• COBISS.SI-ID: 196165379
• Datum objave v RUL: 05.06.2024

Gradivo je del revije

• Naslov: Inorganic chemistry
• Skrajšan naslov: Inorg. chem.
• Založnik: American Chemical Society
• ISSN: 1520-510X
• COBISS.SI-ID: 512805401

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: zlitine, kristalna struktura, kemična sestava, nukleinske kisline