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We have studied the effect of Iridium doping (Rh$_{17-x}$Ir$_{x}$S$_{15}$) inthe Rhodium sites of the strongly correlated superconductor Rh$_{17}$S$_{15}$.Even at low levels of doping (x = 1 and 2) we see a drastic change in thesuperconducting properties as compared to those of the undoped system. Wededuce that there is a reduction in the density of states at the Fermi levelfrom reduced Pauli susceptibility and Sommerfeld coefficient in the dopedsamples. Moreover, the second magnetization peak in the isothermalmagnetization scan (`fishtail') which was very prominent in the magnetizationdata of the undoped crystal is suppressed in the doped samples. The temperaturedependence of resistivity of the doped crystals show a remarkably differentbehavior from that of the undoped crystal with the appearance of a minima atlower temperatures, the position of which is fairly constant at differentfields. Our data supports the notion that Iridium, which is a bigger atom thanRhodium expands the lattice thereby, reduces the electron correlations thatexisted due to the interaction between closer lying Rhodium atoms in theundoped system.

Supression of electron correlations in the superconducting alloys of Rh$_{17-x}$Ir$_x$S$_{15}$