Robust Insulating State in Nb-Doped Sr _2 IrO _4
Journal of Superconductivity and Novel Magnetism（2022）
摘要
Sr _2 IrO _4 hosts a J_eff =1/2 Mott insulating state with antiferromagnetic ordering. It has been predicted that proper doping in Sr _2 IrO _4 could lead to possible high-temperature superconductivity. We present a systematic study on the lattice structure and the magnetic and transport properties of a series of Nb-doped Sr _2 IrO _4 samples. The incorporation of Nb leads to an increase of a -axis lattice constant and a decrease of c -axis lattice constant. A detailed structural refinement suggests that the in-plane Ir-O-Ir bond is significantly straightened with increasing Nb doping content. An unexpected robust insulating state has been found in all Nb-doped samples. The present results suggest that the tilted Ir-O-Ir bond angle alone does not explain its transport behavior in doped Sr _2 IrO _4 compound. The lack of sufficient amount of itinerant charge carriers could be responsible for the robust insulating behavior in Sr _2-x Nb _x IrO _4 samples.
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