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A new iridium containing layered cuprate material,IrSr_2Sm_{1.15}Ce_{0.85}Cu_{2.175}O_{10, has been synthesized by conventionalambient-pressure solid-state techniques. The material's structure has beenfully characterized by Rietveld refinement of high resolution synchrotron X-raydiffraction data; tilts and rotations of the IrO_6 octahedra are observed as aresult of a bond mismatch between in-plane Ir-O and Cu-O bond lengths.DC-susceptibility measurements evidence a complex set of magnetic transitionsupon cooling that are characteristic of a reentrant spin-glass ground-state.The glassy character of the lowest temperature, Tg=10 K, transition is furtherconfirmed by AC-susceptibility measurements, showing a characteristic frequencydependence that can be well fitted by the Vogel-Fulcher law and yields a valueof \Delta_(T_f)/[T_f \Delta log({\omega})] =0.015(1), typical of dilutemagnetic systems. Electronic transport measurements show the material to besemiconducting at all temperatures with no transition to a superconductingstate. Negative magnetoresistance is observed when the material is cooled below25 K, and the magnitude of this magnetoresistance is seen to increase uponcooling to a value of MR = -9 % at 8 K.

IrSr_2Sm_{1.15}Ce_{0.85}Cu_{2.175}O_{10}: A Novel Reentrant Spin-Glass Material