Magnetic properties of Dy 1-x Sr x CoO 3-δ (x = 0.67 to 0.95)
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Date
2021-02-04
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Australian Institute of Physics
Abstract
The AC magnetic susceptibility of Dy1-xSrxCoO3-δ has been measured from 17 to 320 K for a range of samples, x = 0.67 to 0.95. These results have shown that for x = 0.95 the systems enters a spinglass state at approximately 131K on cooling. This is demonstrated by a large cusp in the imaginary susceptibility, indicating the onset of time-dependent effects. For smaller x, the system enters a magnetically ordered state at approximately 300K. This state shows evidence for a spin state transition in the Co ions at around 120K [1], but no evidence of a spin-glass phase. Structurally, the system is tetragonal, I4/mmm, becoming closer to cubic as x increases, until at x = 0.95 the system is metrically cubic. Further, as x increases the fraction of Co4+ in the system also increases, as shown by TGA. At x = 0.95 over 50% of the Co sites are 4+, and the mixture of exchange interactions resulting is thought to give rise to the spinglass state. At smaller x the system appears weakly ferromagnetic, probably due to local ferromagnetic clusters [2], with the Dy moments remaining paramagnetic to temperatures below the instrumental limit.
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Keywords
Magnetic properties, Magnetic fields, Temperature range 0065-0233 K, Temperature range 0273-0400 K, Spin glass state, Ferromagnetic materials
Citation
Goossens, D. J., Wilson. K. F., & James, M. (2004). Magnetic Properties of Dy 1-x Sr x CoO 3-δ (x = 0.67 to 0.95). Poster presented to the 28th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, 3-6 February 2004. Retrieved from: https://www.physics.org.au/wp-content/uploads/cmm/2004/04handbook.pdf