Spin-induced strongly correlated magnetodielectricity, magnetostriction effect, and spin-phonon coupling in helical magnet Fe3(PO4)O3

Helical magnets are extremely promising, as they have fascinating magnetic, electric, and phononic properties. Here, we report a spectrum of simultaneously occurring and highly entangled intriguing phenomena induced by helical spin ordering in a noncentrosymmetric and spin-frustrated system Fe-3(PO4)O-3. These phenomena include magnetodielectric effect in the form of a frequency-independent pronounced dielectric peak, clear magnetostriction effect manifested as a dramatic downturn in the thermal variation of lattice parameters, and strong spin-phonon coupling (which displays a unique anomalous hardening and softening of various phonon modes) at temperatures as high as T-N = 163K. The observed dielectric peak is seemingly associated with a structural distortion via the strong magnetostriction effect.

Automated summary

This study reports a spectrum of phenomena induced by helical spin ordering in a noncentrosymmetric and spin-frustrated system Fe-3(PO4)O-3, including magnetodielectric effect, magnetostriction effect, and spin-phonon coupling.