Strong magnetoelastic coupling at the transition from harmonic to anharmonic order in NaFe(WO${}_4$)${}_2$ with 3d${}^5$ configuration

S. Holbein, M. Ackermann, L. Chapon +9

The crystal structure of the double tungstate NaFe(WO${}_4$)${}_2$ arises from that of the spin-driven multiferroic MnWO${}_4$ by inserting non-magnetic Na layers. NaFe(WO${}_4$)${}_2$ exhib…