Spin glass-like properties and exchange bias in La_1.5Sr_0.5CoIrO₆

Highlights: •La_1.5Sr_0.5CoIrO₆ exhibits cluster spin glass properties. •At higher temperatures it exhibits two conventional magnetic transitions. •It presents exchange bias effect at low temperature. •Our results are compared to those of the analogue compound La_1.5Ca_0.5CoIrO₆. - Abstract: In this work we report the synthesis and investigation of magnetic properties of La_1.5Sr_0.5CoIrO₆. Study of temperature dependent magnetization on this double-perovskite compound revealed two anomalies at $T\simeq 88$ K and $T\simeq 68$ K, probably related to antiferromagnetic and ferromagnetic couplings of Co and Ir ions, respectively. At $T\simeq 27$ K there is another anomaly, which was confirmed by means of ac magnetic susceptibility measurements to be related to the emergence of a spin glass(SG)-like phase. Magnetization as a function of applied magnetic field measurements revealed exchange bias effect of the same order of magnitude of that found for La_1.5Ca_0.5CoIrO₆ analogue compound. We compare our results for La_1.5Sr_0.5CoIrO₆ with those reported for La_1.5Ca_0.5CoIrO₆, and discuss the magnetic properties of both materials in terms of their structural and electronic properties.