  We report investigations on the ground state magnetic properties of
intermetallic compound GdCu through dc magnetization measurements. GdCu
undergoes first order martensitic type structural transition over a wide
temperature window of coexisting phases. The high temperature cubic and the low
temperature orthorhombic phases have different magnetic character and they show
antiferromagnetic and helimagnetic orderings below 145 K and 45 K respectively.
We observe clear signature of a glassy magnetic phase below the helimagnetic
ordering temperature, which is marked by thermomagnetic irreversibility, aging
and memory effects. The glassy magnetic phase in GdCu is found to be rather
intriguing with its origin lies in the interfacial frustration due to distinct
magnetic character of the coexisting phases.
