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The pseudobinary Mn  x  Ni 2 Zn 11- x  γ-brass-type phases at low Mn dopant levels ( x = 0.1-0.5) were investigated. Crystal structures were determined for the two loading compositions of x = 0.3 and 0.5. The structures were solved in the cubic space group of I 43 m and are described in close analogy to the Ni 2 Zn 11 parent γ-brass that is based on the 26-atom cluster, consisting of inner tetrahedron (IT), outer tetrahedron (OT), octahedron (OH), and cuboctahedron (CO). The refined site occupancies of the Mn  x  Ni 2 Zn 11- x  ( x = 0.3, 0.5) reveal that the cluster center, which is empty in the Ni 2 Zn 11 , shows a partial occupation by Zn, with a partial depletion of Zn at the IT sites. The OH sites show a mixed Zn/Mn occupation. The OT and CO sites remain intact with respect to Ni 2 Zn 11 . Magnetic properties were studied for the Mn 0.3 Ni 2 Zn 10.7 composition. The temperature-dependent zero-field-cooled and field-cooled magnetization, the ac susceptibility, the M ( H ) hysteresis curves, the thermoremanent magnetization, and the memory effect demonstrate typical broken-ergodicity phenomena of a magnetically frustrated spin system below the spin freezing temperature T  f ≈ 16 K. The Mn 0.3 Ni 2 Zn 10.7 γ-brass phase classifies as a spin glass, originating predominantly from the random distribution of diluted Mn moments on the octahedral partial structure.

Structure and Spin-Glass Magnetism of the MnxNi2Zn11–x Pseudobinary γ-Brasses at Low Mn Contents

Structure and Spin-Glass Magnetism of the Mn_xNi₂Zn_11–x Pseudobinary γ-Brasses at Low Mn Contents