Noncollinear ferromagnetic phases in the Fe2-xMnxAs system

Abstract

The mechanisms of stabilization of noncollinear magnetically ordered phases observed in the interval 1.19 ≤ x ≤ 1.365 in the Fe_2–xMn_xAs are considered in the framework of a model approach that uses the information on the number of d-electron and the shape of density of electronic states derived from ab initio calculations. It is found that the energy stability of noncollinear structures and the order of order–order phase transitions depend on electron filling of the d-band and shape of the density of d-electron states, which depend on manganese concentration. It is shown that the baric characteristics of spontaneous and magnetic field induced order-order phase transitions are associated with the nature of renormalization of the electronic structure under pressure.