Sr 2 IrO 4 has been shown to exhibit a novel J eff =1/2 Mott spin-orbit insulating state with antiferromagnetic ordering. In the present investigation, the effects of Pr substitution at Sr-site on structural, magnetic and electrical properties are studied in Sr 2 IrO 4 . Pr-doped samples still retain the insulating behavior, but with the increase of Pr doping concentration, the resistivity decreases. The magnetic properties show that long-range antiferromagnetic order is collapsed when the Pr doping content increases up to 20%, which may results from a competition between the AFM (Ir 5d electrons) and ferromagnetic (Pr 4 f electrons) coupling. In addition, Pr doping induces a spin glasslike state at low temperatures.

Herein, the structure and magnetic properties of the breathing pyrochlore compound LiInCr4−xFexO8 (x = 0, 0.2, 0.4, 0.5) are reported. Raman scattering experiments show the hardening behavior of the active mode induced by the increased ionic masses and bond strength. The long‐range antiferromagnetic order and spin‐gap state of parent samples are found to be suppressed with the increasing Fe content. The average magnetic exchange couplings are strongly antiferromagnetic and systematically enhanced with substitution. Bulk magnetization data of substituted samples show weak ferromagnetic interaction and occurrence of a spin‐glass‐like transition at high Fe contents.

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