Pressure effect on magnetic transition temperature and magnetic phase diagram of Mn2−xCoxSb

Pressure effects on spin‐flop transition temperature (Tsf) of Mn2−xCoxSb have been measured in order to study the nature of spin‐flop phase transitions. The magnetic phase diagrams for Tsf versus concentration and for Tsf versus pressure have been determined. Tsf increases with increasing applied pressure (dTsf/dp=2.9 K/kbar for x=0.05, dTsf/dp=3.7 K/kbar for x=0.10, dTsf/dp=3.3 K/kbar for x=0.15, and dTsf/dp=2.7 K/kbar for x=0.20). On the other hand, Tsf decreases slowly with x up to ≂0.05 and increases rapidly under further increasing x at normal atmospheric pressure. On the basis of these results, the microscopic origin of the magnetic anisotropy of Mn2−xCoxSb is discussed.