Varying A-site radius and size disorder to tune magnetic ordering in compositionally complex perovskite oxides

Abstract

A long standing goal of magnetochemists is to be able to control ordering temperatures through compositional engineering. Here we report the synthesis of a perovskite oxide with twelve cations accommodated within a single phase solid solution, AM7O${}_3$, A = La${}_{\frac{1}{5}}$Sm${}_{\frac{1}{5}}$Gd${}_{\frac{1}{5}}$Nd${}_{\frac{1}{5}}$Dy${}_{\frac{1}{5}}$ (A5), and M7 = Ti${}_{\frac{1}{7}}$Cr${}_{\frac{1}{7}}$Mn${}_{\frac{1}{7}}$Fe${}_{\frac{1}{7}}$Co${}_{\frac{1}{7}}$Ni${}_{\frac{1}{7}}$Cu${}_{\frac{1}{7}}$. Bulk magnetometry measurements for A5M7O${}_3$, as well as for A = La, Gd and La${}_{\frac{1}{2}}$Gd${}_{\frac{1}{2}}$, show that all these compounds magnetically order as ferrimagnets between 89 and 115 K. We find that the magnetic properties are influenced by considering a combination of the size disorder parameter alongside the A-site cationic radii and valence electrons.

7 pages, 5 figures