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The temperature dependence of magnetic susceptibility of theBi$_{2-y}$Sr$_{y}$Ir$_{2}$O$_{7}$ system was studied from 2 to 300 K. Accordingto these measurements, the solid solution $(0\leq y\leq 0.9)$ does not show anymagnetic transition; however, a noticeable deviation from the Curie-Weiss lawoccurs and the magnetic behavior of this system can be ascribed to short-rangemagnetic order that is also present in several geometrically frustratedsystems. The Pauli magnetic susceptibility decreases as the Sr contentincreases, this can be associated with a shift towards Ir$^{5+}$ in samples;also the Ir effective magnetic moment decreases. The estimated Wilson-ratioindicates the presence of strong electron-electron correlations.

Magnetic Behaviour of the $Bi_{2-y} Sr_y Ir_2 O_7$ Pyrochlore Solid Solution