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(a) The variation of structure from Hg2CuTi-type Mn2CoGa to Cu2MnAl-type CoMnGa2, in which the Mn/Ga layer transforms into Ga/Ga layer. A, B, C, and D represent four interpenetrating fcc sublattices of Mn(A), Mn(B)/Ga(B), Co(C), and Ga(D), whose Wyckoff coordinates are (00 0), (1/4 1/4 1/4), (1/2 1/2 1/2), and (3/4 3/4 3/4), respectively. The arrows in different direction represent the alignment of the atomic moments. (b) XRD patterns of Mn50− x Co25Ga25+ x alloys (x = 0, 12.5, 25). Insets on the left are the superlattice reflection peaks of (111) and (200). Inset on the top right corner shows composition dependence of the lattice parameters of Mn50−xCo25Ga25+x alloys. The straight lines are from linear fitting.
(a) Composition dependence of molecular moments, experimental (solid triangle) and calculated (open triangle), and the saturation magnetic field in Mn50− x Co25Ga25+ x alloys. The inset shows the magnetic field dependence of magnetization curves measured at 5 K. (b) Composition dependence of the calculated atomic moments of Mn (A) and Co (C) in Mn50− x Co25Ga25+ x alloys. The straight lines represent the linearly fitting for the calculated results.
Schematic diagram for the changes of magnetic structure projected along the  plane in Mn50− x Co25Ga25+ x (x = 0, 12.5, 25) alloys.
Composition dependence of Curie temperature of Mn50− x Co25Ga25+ x alloys. The straight line results from the linearly fitting the experimental data. The inset is the M-T curves of the samples (x = 0, 12.5, 25) under a magnetic field of 100 Oe for Curie temperature determining.
Calculated molecular magnetic moments (Mcalc. ) and measured molecular magnetic moments (Mexp. ) (in μ B/f.u.), as well as the calculated atomic magnetic moments (in μ B/atom) for Mn50−xCo25Ga25 + x alloys with various compositions.
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