High-Temperature Itinerant Ferromagnetism in a σ -Phase High-Entropy Alloy (FeCr)0.67(MnNiV)0.33
Artykuł w czasopiśmie
MNiSW
200
Lista 2024
| Status: | |
| Autorzy: | Idczak Rafał, Nowak Wojciech, Sobota Piotr, Pikula Tomasz, Panek Rafał, Satuła Dariusz |
| Dyscypliny: | |
| Aby zobaczyć szczegóły należy się zalogować. | |
| Rok wydania: | 2026 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Wolumen/Tom: | 57 |
| Strony: | 5409 - 5418 |
| Impact Factor: | 3,0 |
| Web of Science® Times Cited: | 0 |
| Scopus® Cytowania: | 0 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Finansowanie: | This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | TAK |
| Licencja: | |
| Sposób udostępnienia: | Witryna wydawcy |
| Wersja tekstu: | Ostateczna wersja opublikowana |
| Czas opublikowania: | W momencie opublikowania |
| Data opublikowania w OA: | 21 września 2026 |
| Abstrakty: | angielski |
| A σ-phase high-entropy alloy with nominal composition (FeCr)0.67(MnNiV)0.33 has been synthesized and investigated using structural, magnetic, thermodynamic, and local spectroscopic techniques. Room-temperature X-ray diffraction confirms the stabilization of the σ-phase lattice, characterized by five crystallographically inequivalent atomic sites randomly occupied by multiple transition metal elements. DC magnetization measurements reveal the onset of ferromagnetic order at T_C = 322(2) K, exceeding Curie temperatures reported so far for σ-phase alloys. Despite the high ordering temperature, the magnetic response is dominated by a small spontaneous moment, pronounced field dependence, and lack of saturation in high magnetic fields, indicating a magnetically itinerant ground state. Specific heat data show a broad magnetic contribution near T_C, together with a low-temperature excess term, pointing to strong spin fluctuations and slow magnetic dynamics. 57Fe Mössbauer spectroscopy does not reveal well-resolved magnetic splitting, indicating that the local magnetic polarization at Fe sites remains weak even within the magnetically ordered state. Taken together, these results establish the coexistence of long-range magnetic order and strong itinerancy in a chemically complex σ-phase alloy, highlighting high-entropy design as an effective route for realizing high-temperature itinerant ferromagnetism in chemically disordered and structurally complex crystal structures. |
