Abstract
Low-dimensional and geometrically frustrated spin-chain Sr3(Co/Ni)IrO6 compounds exhibit interesting physical phenomena due to the exotic anisotropy associated with the spin–orbit entangled Ir4+ state. Temperature dependent magnetic susceptibility of polycrystalline Sr3CoIrO6 characterizes the partially-disordered antiferromagnetic with TN1 ∼ 90 K and the frozen state of this antiferromagnetic order below TN2 ∼ 30 K. The fitting of χT versus T (K) data to the Ising model reveal that the intra-chain exchange interactions are ferromagnetic, whereas the inter-chain exchange correlations are antiferromagnetic. Field-induced alteration of the partially-disordered antiferromagnetic state in the temperature regime of TN1 ≤ T ≤ TN2 is responsible for the anomalous magnetic hysteresis loop. Further, a large value of isothermal magnetic-entropy change (ΔSM ∼ 22 J kg−1K−1 for 7 T), absence of thermal hysteresis in magnetization and highly insulating nature consents Sr3CoIrO6 to be classified as a good magnetocaloric material for the low-temperature refrigeration.
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