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We report investigations on the ground state magnetic properties ofintermetallic compound GdCu through dc magnetization measurements. GdCuundergoes first order martensitic type structural transition over a widetemperature window of coexisting phases. The high temperature cubic and the lowtemperature orthorhombic phases have different magnetic character and they showantiferromagnetic and helimagnetic orderings below 145 K and 45 K respectively.We observe clear signature of a glassy magnetic phase below the helimagneticordering temperature, which is marked by thermomagnetic irreversibility, agingand memory effects. The glassy magnetic phase in GdCu is found to be ratherintriguing with its origin lies in the interfacial frustration due to distinctmagnetic character of the coexisting phases.

Spin-glass-like state in GdCu: role of phase separation and magnetic frustration