Abstract
We report the systematic study of structural, magnetic, and electrical transport properties of Y2−xBixIr2O7 (x=0.0, 0.1, 0.2, and 0.3) pyrochlore iridates. Chemical doping enhances electrical conductivity and antiferromagnetic correlation substantially. The replacement of a nonmagnetic Y3+ ion with nonmagnetic Bi3+ in Y2Ir2O7 tends to reduce the octahedral distortion, thus enhancing the antiferromagnetic correlation. Raman spectroscopy shows that the Ir–O bond contracts slightly, and the R–O′ bond turns longer as disorder and phononic oscillation are reduced by Bi doping, leading to wider t2g bands, which enhances the electrical conductivity. Additionally, the enhancement in electrical conductivity and antiferromagnetic correlation with Bi3+ doping is attributed to the hybridization between the Y3+(4p)/Bi3+(6s/6p) orbital with the Ir4+(5d) orbital as a result of enhancement in the Ir–O–Ir bond angle and contraction in the Ir–O bond length.
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