Spin liquid like Raman signatures in the hyperkagome iridate Na4Ir3O8

Gupta, Satyendra Nath and Sriluckshmy, P V and Balodhi, Ashiwini and Muthu, D V S and Singh, Yogesh and Ramakrishnan, T V and Sood, A K (2016) Spin liquid like Raman signatures in the hyperkagome iridate Na4Ir3O8. In: PHYSICAL REVIEW B, 94 (15).

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Abstract

Combining Raman scattering measurements with mean-field calculations of the Raman response, we show that Kitaev-like magnetic exchange is dominant in the hyperkagome iridate Na4Ir3O8. In the measurements we observe a broad Raman band at similar to 3500 cm(-1) with a bandwidth similar to 1700 cm(-1). Calculations of the Raman response of the Kitaev-Heisenberg model on the hyperkagome lattice shows that the experimental observations are consistent with the calculated Raman response where the Kitaev exchange interaction (J(K)) is much larger than the Heisenberg term J(1) (J(1)/J(K) similar to 0.1). A comparison with the theoretical model gives an estimate of the Kitaev exchange interaction parameter.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	21 Dec 2016 07:17
Last Modified:	21 Dec 2016 07:17
URI:	http://eprints.iisc.ac.in/id/eprint/55467

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