Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 15: Poster I
MA 15.8: Poster
Dienstag, 18. März 2025, 10:00–12:30, P1
Static and dynamic magnetic properties in the Li-rich antiperovskite (Li2Fe)ChO (Ch = S, Se) — •F.L. Carstens1, F. Seewald2, T. Schulze2,3, N. Gräßler3, M.A.A. Mohamed3, S. Hampel3, L. Singer1, H.-H. Klauss2, H.-J. Grafe3, and R. Klingeler1 — 1Kirchhoff Institute for Physics, Heidelberg University, Germany — 2Institut für Festkörperphysik, TU Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research IFW Dresden, Germany
The recently discovered class of lithium-rich antiperovskites crystallize in cubic antiperovskite crystal structure such that Li+ and transition metal ions TM2+ are randomly distributed at the same atomic position. They octahedrally coordinate central O2− ions while the chalcogens (S2−/Se2−) are at corners of the cubic crystallographic cell. Despite their compelling properties as high-capacity cathode materials, very little is known about their electronic and magnetic properties. Here, we report static magnetisation, Mössbauer, and NMR studies on Li-rich antiperovskite (Li2Fe)ChO (Ch = S, Se). Our data show a Pauli paramagnetic-like behaviour, a long-range antiferromagnetically ordered ground state and a regime of short-range magnetic order at least up to 100 K. Our results are consistent with predominantly random Li-Fe distribution on the shared lattice position. In addition, the effect of Li-hopping is observed and discussed. Overall, our data elucidate magnetism in a disordered presumably semimetallic system with thermally induced ionic dynamics.
Keywords: antiperovskite; magnetism; disorder