“…High-entropy alloys have attracted a significant amount of research interest in recent years, the materials incorporate multiple principle elements and were first reported by Yeh et al The high-entropy alloys were found to have improved hydrogen storage and tensile strength. , The approach has more recently been expanded to include ceramics and oxides. − As a result, there have now been several studies regarding compositionally complex and high-entropy perovskites, particularly those with the ABO 3 type structure. − The compositionally complex n = 1 Ruddlesden–Popper perovskites have only more recently been reported with research largely focused on the cuprate and thin film-based materials. − However, a more recent study investigated the local ordering of the cations in a compositionally complex n = 1 Ruddlesden–Popper perovskite for the first time . These types of materials display a wide range of functional properties, including ionic conductivity, magnetism, and ferroelectricity. ,, The magnetic properties of ABO 3 type compositionally complex perovskites have generally been antiferromagnetic in nature with a small ferrimagnetic moment as observed in both the RE(M5)O 3 and (RE5)MO 3 , where RE are rare earth elements (Gd, La, Nd, Sm, and Y) and M are transition metals (Co, Cr, Fe, Mn, and Ni). ,, A similar effect was recently reported in a study focusing on the Sm(M4)O 3 compounds where M = Co, Cr, Fe, and Mn. The difference in zero-field and field-cooled magnetization data is often attributed to glassy behavior without further investigation but is more likely due to the inhomogeneous nature of the samples …”