Metamagnetism stabilized giant magnetoelectric coupling in ferroelectric \textit{x}BaTiO${}_3$-(1-\textit{x})BiCoO${}_3$ solid solution

Abstract

In order to establish the correlation between the magnetoelectric coupling and magnetic instability, we have studied the structural, magnetic, and ferroelectric properties of \textit{x}BaTiO${}_3$-(1-\textit{x})BiCoO${}_3$ as a function of BaTiO${}_3$ concentration ($x$) and volume.The $G-$type antiferromagnetic ordering is found to be energetically favorable for $x<$ 0.45 and higher concentrations stabilize with nonmagnetic states. We observe metamagnetic spin state transitions associated with paraelectric to ferrolectric transitions as a function of volume and $x$ using synchrotron diffraction and computational studies, indicating a strong magnetoelectric coupling. Specifically for $x=$ 0.33 composition, a pressure induced high spin (HS) to low spin (LS) transition occurs when the volume is compressed below 5\%. Our orbital$-$projected density of states show a HS state for Co${}^{3+}$ in the ferroelectric ground state for $x<$ 0.45 and the corresponding paraelectric phase is stable in the nonmagnetic state due to the stabilization of LS state as evident from our fixed$-$spin$-$moment calculations and magnetic measurements. High values of spontaneous ferroelectric polarizations are predicted for lower $x$ values which inversely vary with $x$ because of the reduction of tetragonality ($c/a$) with increase in $x$. Moreover, we find that the HS$-$LS transition point and magnetoelectric coupling strength can be varied by $x$.

30 pages

References in corpus (3)

• Origin of magnetoelectric behavior in BiFeO${}_3$
• Direct Role of Structural Dynamics in Electron-Lattice Coupling of Superconducting Cuprates
• Electronic and magnetic structures of hole doped trilayer La(4-x)Sr(x)Ni3O8 from first principles calculations