Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.1: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Gapped ground state in a new V(IV) based sawtooth chain — •Ralf Feyerherm1, Tim Müller2, and Gündog Yücesan2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin — 2Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf
The sawtooth chain (or delta chain) consists of edge-sharing triangles of magnetic ions carrying Heisenberg spins. Assuming antiferromagnetic interactions between the spins, it is a relatively simple model system for studying the effect of magnetic frustration. Despite extensive theoretical literature, experimental realizations of antiferromagnetic sawtooth chains are very rare. Recently, we (TM and GY) synthesized [VO(2,2’-bpy)(H2O)][V(µ-O)(C6H5PO3)2]2H2O, a new Vanadyl complex, in which V(IV) ions with S = 1/2 form a sawtooth chain. The T dependence of the magnetic susceptibility χ suggests a dimerized state with J = 18 K and a gap of 36 K, consistent with heat capacity data. Notably, χ(T) cannot be well described by the Bleaney-Bowers equation, suggesting that a simple dimer model does not work. The magnetization M(H) at 2 K starts to increase steeply above ≈ 80 kOe and reaches a value of 0.065 µB per f.u. at 140 kOe. High-field magnetization measurements are under way to search for a possible Msat/2 plateau predicted theoretically for a specific range of parameters.
Keywords: Sawtooth chain; Delta chain; High-field magnetization; Vanadyl complex; Frustrated magnet