Abstract
Most earlier work on the effect of chemical substitution in multiferroic MnWO${}_{4}$ has focused on the 3$d$ transition metal substitution of Mn. In this paper, we investigate the Ru substitution of Mn in polycrystalline Mn${}_{1\ensuremath{-}x}$Ru${}_{x}$${}_{/2}$WO${}_{4}$ in order to unveil the consequence of 4$d$ transition metal substitution in terms of magnetic transitions and ferroelectricity. It is found that the Ru substitution substantially reshuffles the magnetic frustration and stabilizes the incommensurate helical spin-order phase (AF2) by partially suppressing the collinear spin-order phase (AF1 phase). The coexistence of the AF2 and AF1 phases at low temperature is suggested. Consequently, the ferroelectric polarization is remarkably enhanced, accompanied with significant response of the polarization to magnetic field. It is argued that the structural distortion and enhanced spin-orbital coupling associated with the Ru substitution may be responsible for this ferroelectricity enhancement.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
