Experimental and theoretical results of the study of MnFeAs y P 1- y (0.15 ≤ y ≤ 0.66) and Mn 2- x Fe x As 0.5 P 0.5 (0.5 ≤ x ≤ 1.0) systems were analyzed in order to determine the main factors responsible for the mechanism by which antiferromagnetic phase is formed in each of the two systems. It is shown that in the case of cation substitution in the Mn 2- x Fe x As 0.5 P 0.5 system the main contribution to the mechanism of changing the magnetic ordering phase type is due to a considerable change of electron filling of the magnetically active d -band. As for the MnFeAs y P 1- y system with anion substitution, destabilization of the ferromagnetic phase and formation of the antiferromagnetic phase with decreasing As concentration may be due to the changes in the density of electronic states because of a considerable reduction of the unit cell volume.
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Peculiarities of magnetically ordered phase formation during anion and cation substitutions in MnFeAs y P 1- y and Mn 2 - x Fe x As 0.5 P 0.5 systems
Valkov, V. I.; Golovchan, A. V.; Szymczak, H.; Dyakonov, V. P.
Follow Low Temperature Physics
, Volume 38 (1)
American Institute of Physics – Jan 1, 2012
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