Unconventional spin-phonon coupling via the Dzyaloshinskii–Moriya interaction

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DOI	Resolve DOI: https://doi.org/10.1038/s41535-019-0157-0
Author	Search for: Son, Jaeseok; Search for: Park, Byung Cheol; Search for: Kim, Choong H.ORCID identifier: https://orcid.org/0000-0002-9149-1401; Search for: Cho, Hwanbeom; Search for: Kim, So Yeun; Search for: Sandilands, Luke J.; Search for: Sohn, Changhee; Search for: Park, Je-Geun ORCID identifier: https://orcid.org/0000-0002-3930-4226; Search for: Moon, Soon Jae; Search for: Noh, Tae Won ORCID identifier: https://orcid.org/0000-0003-1905-2321
Format	Text, Article
Subject	magnetic properties and materials; phase transitions and critical phenomena
Abstract	Spin-phonon coupling (SPC) plays a critical role in numerous intriguing phenomena of transition metal oxides (TMOs). In 3d and 4d TMOs, the coupling between spin and lattice degrees of freedom is known to originate from the exchange interaction. On the other hand, the origin of SPC in 5d TMOs remains to be elucidated. To address this issue, we measured the phonon spectra of the 5d pyrochlore iridate Y₂Ir₂O₇ using optical spectroscopy. Three infrared-active phonons soften below the Néel temperature of TN ≈ 170 K, indicating the existence of strong SPC. Simulations using density functional theory showed that the coupling is closely related to the Ir–O–Ir bond angle. A tight-binding model analysis reveals that this SPC is mainly mediated by the Dzyaloshinskii–Moriya interaction rather than the usual exchange interaction. We suggest that such unconventional SPC may be realized in other 5d TMOs with non-collinear magnetic order.
Publication date	2019-12
Publisher	Springer Nature Limited
Licence	Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
In	npj Quantum Materials 4, no. 1, 17 (December 2019).
Language	English
Peer reviewed	Yes
NRC publication	This is a non-NRC publication "Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.
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Record identifier	1807786f-c195-4e6c-b63c-f2047bc12aeb
Record created	2020-12-04
Record modified	2021-03-01

Date modified:: 2025-02-07