Structural and magnetic properties of the layered compound Ca2.375La0.125Sr0.5GaMn2O8

摘要

The brownmillerite-type layered compound Ca2.375La0.125Sr0.5GaMn2O8 has been synthesized. The crystal and magnetic structures have been refined by the Rietveld analysis of the neutron powder diffraction patterns at 300 and 20 K. This compound crystallizes in the orthorhombic symmetry under the space group Pcm21 (e?‘? = 5.447(2), e?‘? = 11.359(4) and e?‘? = 5.322(2) ?…). The compound is found to be antiferromagnetic at 20 K. The ordered Mn magnetic moment, aligned along the crystallographic e?‘?-direction, is derived to be 2.53(5) e???e??μ per Mn ion at 20 K.