Rathi, A. and Rout, P. K. and Perween, Sonam and Singh, R. P. and Babu, P. D. and Gupta, Anurag and Pant, R. P. and Basheed, G. A. (2018) Signature of a Griffiths phase in layered canted antiferromagnet Sr2IrO4. Journal of Magnetism and Magnetic Materials, 468. pp. 230-234. ISSN 0304-8853

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Abstract

The complex magnetic nature of 5d layered iridate Sr2IrO4, owing to Ir0 6 octahedral rotation has triggered great interest in recent years. In this article, we investigated the magnetic excitations in layered canted antiferromagnet Sr2IrO4 via dc magnetization measurements and report the Griffiths phase (GP) signatures above the magnetic ordering temperature T-N. The non-analytic nature of GP leads to unique critical exponent, beta = 0.75(1) extracted from modified Arrott plot, in corroboration with magneto-caloric study. However, the analysis by Bray model in GP regime yields a reliable critical exponent value of beta = 0.18(1), belonging to two-dimensional XYh(4) universality class. The study also suggests a new picture of largely debated insulating nature of Sr2IrO4 in context of GP above T-N.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Materials Science Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	27 Sep 2019 08:20
Last Modified:	27 Sep 2019 08:20
URI:	http://npl.csircentral.net/id/eprint/3944

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