  We have investigated the effect of Cu substitution in Eu2(Ir1-xCux)2O7 with
the help of magnetic and transport property measurements. XPS measurement
reveals that each Cu2+ converts Ir4+ to double amount of Ir5+ ions. The
metal-insulator transition temperature (T_MI) is obtained around 120 K. In the
insulating phase, at lower temperature below 50 K, the temperature dependent
resistivity follows a power law dependence and the magnitude of the exponent
increases with Cu concentrations. The temperature dependent thermopower is
observed to follow the electrical resistivity down to 50 K, except for a sudden
drop in thermopower at temperature below 50 K. We find negligible Hall voltage
in the metallic regime of the samples but a sudden Hall voltage is developed
below 50 K. We observe bifurcation in zero field cooled and field cooled
(ZFC-FC) magnetization below irreversibility temperature, exchange bias and
negative magnetoresistance at 3 K and the magnitude of all these properties
increases with Cu concentrations. In the insulating region (below 6 K) there
exists a linear specific heat and its coefficient decreases with Cu doping
which indicates the reduction of spinon contribution with Cu doping.
