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Probing signatures of fractionalization in the candidate quantum spin liquid Cu2IrO3 via anomalous Raman scattering

Pal, S and Seth, A and Sakrikar, P and Ali, A and Bhattacharjee, S and Muthu, DVS and Singh, Y and Sood, AK (2021) Probing signatures of fractionalization in the candidate quantum spin liquid Cu2IrO3 via anomalous Raman scattering. In: Physical Review B, 104 (18).

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Official URL: https://doi.org/10.1103/PhysRevB.104.184420


Long-range entanglement in quantum spin liquids (QSLs) leads to novel low-energy excitations with fractionalized quantum numbers and (in two dimensions) statistics. Experimental detection and manipulation of these excitations present a challenge particularly in view of diverse candidate magnets. A promising probe of fractionalization is their coupling to phonons. Here, we present Raman scattering results for the S=1/2 honeycomb iridate Cu2IrO3, a candidate Kitaev QSL with fractionalized Majorana fermions and Ising flux excitations. We observe anomalous low-temperature frequency shift and linewidth broadening of the Raman intensities in addition to a broad magnetic continuum, both of which, as we derive, are naturally attributed to the phonon decaying into itinerant Majoranas. The dynamic Raman susceptibility marks a crossover from the QSL to a thermal paramagnet at �120 K. The phonon anomalies below this temperature demonstrate a strong phonon-Majorana coupling. These results provide evidence of spin fractionalization in Cu2IrO3. © 2021 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Author.
Keywords: Copper compounds; Iridium compounds; Quantum entanglement; Raman scattering; Temperature, Frequency shift; Frequency-linewidth; Liquid lead; Low-energy excitations; Lows-temperatures; Majorana; Quantum numbers; Quantum spin liquid; Shift-and; Two-dimensions, Phonons
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 Jan 2022 06:18
Last Modified: 06 Jan 2022 06:18
URI: http://eprints.iisc.ac.in/id/eprint/70839

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