Abstract
In this study we report results of X-ray diffraction and dc magnetization measurements in Mn 1-x Al 1-y Cu x+y alloys in the κ phase which has a B2 (CsCl-type) structure. Increasing Cu doping not only weakens the ferromagnetic order and strongly affects Curie temperature (T c ) but also imposes a competition mechanism between ferromagnetic and ferromagnetic spin correlations which induces the appearance of cluster spin-glasslike phase at low temperatures.
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