Magnetic order and magnetic properties of the oxygen deficient SmBaMn2O5 layered perovskite

Magnetism in SmBaMn2O5 was investigated on a single crystal by magnetic and neutron diffraction measurements. This is an oxygen deficient perovskite with a layered ordering of Sm and Ba cations. Mn atoms are coordinated with five oxygens forming a square pyramid and they are ordered in a checkerboard pattern of expanded-compressed pyramids in the ab-plane. The neutron diffraction study revealed a ferrimagnetic ordering of Mn moments below T-N=134 K. Macroscopic measurements reveal a very anisotropic behavior. Measurements with the external magnetic field parallel (M-||c) and perpendicular (M-||c) to the c-axis confirm that this is the easy axis above 10 K. Below this temperature, the Sm sublattice begins to polarize and the magnetization M-||c decreases while M-||c experiences a huge increase. This indicates that Sm moments begin to order around 10 K in the ab-plane with a minor component on the c-axis that opposes the overall magnetization from Mn sublattices.

Automated summary

The magnetism of SmBaMn2O5 was studied using magnetic and neutron diffraction measurements on a single crystal. The compound has an oxygen deficient perovskite structure with a layered ordering of Sm and Ba cations. The Mn atoms are arranged in a checkerboard pattern in the ab-plane, forming expanded-compressed pyramids. Below 134 K, the Mn moments exhibit ferrimagnetic ordering, while the Sm moments begin to polarize around 10 K in the ab-plane.