Signature of a Griffiths phase in layered canted antiferromagnet Sr2IrO4
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Signature of a Griffiths phase in layered canted antiferromagnet Sr2IrO4
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| Creator |
Rathi, A.
Rout, P. K. Perween, Sonam Singh, R. P. Babu, P. D. Gupta, Anurag Pant, R. P. Basheed, G. A. |
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| Subject |
Materials Science
Physics |
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| Description |
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.
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| Publisher |
Elsevier
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| Date |
2018-12-15
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/3944/1/Signature%20of%20a%20Griffiths%20phase.pdf
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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| Relation |
http://npl.csircentral.net/3944/
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