MAGNETIC-PROPERTIES OF (CR,MN)2AS SYSTEM

Cr2As and Mn2As, both being isomorphous with Cu2Sb type crystal structure, have been known as antiferromagnets with different magnetic structures. They are found to form a series of solid solutions with isomorphous replacement of chromium by manganese. Site preference of each kind of atom is observed that chromium occupies site-I of this crystals structure in preference to site-II. The solid solutions are found to be antiferromagnets in the whole range of composition. (Cr1−xMnx)2As system is divided into three regions in terms of the magnetic structure. In the first region 0.0≤x≤0.24, the magnetic structure is the same as Cr2As. Second (intermediate) and third (manganese rich) regions are in the range of 0.25≤x≤1.0. In the third region, the magnetic ordering is of Mn2As type. A new magnetic structure, which is observed in the second region, is understood as the intermediate spin structure between Cr2As and Mn2As structures. © 1978, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.