Abstract
The structurally ordered μ-Al4Mn complex intermetallic phase with 563 atoms in the giant unit cell shows the typical broken-ergodicityphenomena of a magnetically frustrated spin system. The low-field zero-field-cooled andfield-cooled magnetic susceptibilities show splitting below the spin freezing temperatureTf = 2.7 K. The ac susceptibility exhibits a frequency-dependent cusp,associated with a frequency-dependent freezing temperatureTf(ν). The decay of the thermoremnant magnetization is logarithmicallyslow in time and shows a dependence on the aging timetw and thecooling field Hfc typical of an ultraslow out-of-equilibrium dynamics of a nonergodic spinsystem that approaches thermal equilibrium, but can never reach it onthe experimentally accessible time scale. The above features classify theμ-Al4Mn complex intermettalic among spin glasses. The origin of frustration of magneticinteractions was found to be geometrical due to the distribution of a significantfraction of Mn spins on triangles with antiferromagnetic coupling. Theμ-Al4Mn phase is a geometrically frustrated spin glass.
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