Partially-disordered to frozen-state crossover induced magnetocaloric properties of the antiferromagnetic one-dimensional spin-chain Sr 3 CoIrO 6

Krishna Murthy, J and Nileena, N and Vishnugopal, VS and Anil Kumar, PS (2019) Partially-disordered to frozen-state crossover induced magnetocaloric properties of the antiferromagnetic one-dimensional spin-chain Sr 3 CoIrO 6. In: Materials Research Express, 6 (5).

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Abstract

Low-dimensional and geometrically frustrated spin-chain Sr 3 (Co/Ni)IrO 6 compounds exhibit interesting physical phenomena due to the exotic anisotropy associated with the spin-orbit entangled Ir 4+ state. Temperature dependent magnetic susceptibility of polycrystalline Sr 3 CoIrO 6 characterizes the partially-disordered antiferromagnetic with T N1 ∼ 90 K and the frozen state of this antiferromagnetic order below T N2 ∼ 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 T N1 ≤ T ≤ T N2 is responsible for the anomalous magnetic hysteresis loop. Further, a large value of isothermal magnetic-entropy change (ΔS M ∼ 22 J kg -1 K -1 for 7 T), absence of thermal hysteresis in magnetization and highly insulating nature consents Sr 3 CoIrO 6 to be classified as a good magnetocaloric material for the lowerature refrigeration.

Item Type:	Journal Article
Publication:	Materials Research Express
Publisher:	Institute of Physics Publishing
Additional Information:	The copyright for this article belongs to the Institute of Physics Publishing.
Keywords:	Antiferromagnetism; Cobalt compounds; Hysteresis; Iridium compounds; Ising model; Magnetic susceptibility; Magnetocaloric effects; Metamagnetism; Quantum entanglement; Spin dynamics; Strontium compounds, Antiferromagnetic orderings; Antiferromagnetic state; Isothermal magnetic entropy change; Magnetocaloric materials; Magnetocaloric properties; One dimensional spin chains; Temperature-dependent magnetic susceptibility; Thermal hysteresis in magnetizations, Magnetic materials
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	16 Apr 2019 06:46
Last Modified:	26 Aug 2022 03:33
URI:	https://eprints.iisc.ac.in/id/eprint/62113

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