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Non-Fermi liquid behavior in some fermionic systems have attractedsignificant interest in last few decades. Certain pyrochlore iridates withstronger spin-orbit coupling strength have recently been added to the list.Here, we provide evidence of such a non-Fermi liquid ground state in anothermixed valent metallic pyrochlore iridate Pb$_2$Ir$_2$O$_{7-\delta}$, throughthe combined investigation of electronic, magnetic and thermodynamic propertiesas a function of temperature ($T$) and applied magnetic field ($H$).Resistivity measurement showed a linear temperature dependence down to 15~Kbelow which it shows $\rho \sim T^{3/2}$ dependence while magneticsusceptibility diverges as $\chi$(T) $\sim$ $T^{-\alpha}$ ($\alpha < 1$) below10~K. While a strong negative $\Theta_{CW}$ has been observed from Curie-Weissfitting, absence of any long range order down to 80~mK only indicates presenceof strong inherent geometric frustration in the system. Heat capacity datashowed $C_p$ $\sim$ $T\ln(T_0/T)$ + ${\beta}T^3$ dependence below 15~K down to1.8~K. More importantly spin-orbit coupling strength by x-ray absorptionspectroscopy was found to be weaker in Pb$_2$Ir$_2$O$_{7-\delta}$ compared toother pyrochlore iridates. In absence of any large moment rare earth magneticion, Pb$_2$Ir$_2$O$_{7-\delta}$ presents a rare example of an irirdate systemshowing non-Fermi liquid behaviour due to disordered distribution of Ir$^{4+}$and Ir$^{5+}$ having markedly different strengths of spin-orbit coupling whichmight offer a prescription for achieving new non-Fermi liquid systems.

Non-Fermi liquid behavior in a mixed valent metallic pyrochlore iridate Pb$_2$Ir$_2$O$_{7-\delta}$