Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Frustrated Magnets II

MA 40.4: Talk

Thursday, March 20, 2025, 15:45–16:00, H20

Emergent degeneracies in weakly coupled sawtooth chains: the case of bobkingite — •P. Peter Stavropoulos¹, Aleksandar Razpopov¹, Harrison LaBollita², Antia S. Botana³, Michael R. Norman⁴, and Roser Valentí¹ — ¹Goethe University, Frankfurt, Germany — ²Flatiron Institute, New York, USA — ³Arizona State University, Tempe, USA — ⁴Argonne National Laboratory, Lemont, USA

The sawtooth chain, otherwise known as the Δ chain, has a long history as a minimal model of frustrated magnetism, serving as a realization of Shastry-Sutherland type solitons. While many material candidates, like delafossite, euchroit, atacamite, as well as fluorides, have been investigated, they leave much to be desired in the way of the ideal sawtooth chain. Here we present a proposal for revisiting a copper hydrate, bobkingite. Using ab initio methods we estimate the magnetic exchanges between copper sites, and find a spin model consisting of nearly ideal sawtooth chains, weakly coupled to its neighbors. We analyze the classical model of the coupled sawtooth chains, revealing emergent system size scaling degeneracies.

Keywords: Furstrated; Sawtooth chain; Copper hydrate; Classical Spin model; DFT