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. 2023 May 3;617(7959):73–78. doi: 10.1038/s41586-023-05853-8

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Extended Data Fig. 10 — (a) Pseudo-dielectric function for the b-axis of YTiO₃ plotted at several different temperatures. Arrows indicate the three modes excited in our experiment. (b) Frequency shifts for the 4, 9, and 17 THz modes as a function of temperature with the anharmonic background subtracted off. The additional shifts are related to spin-phonon coupling, and the anomalous behavior at high temperatures indicates the presence of local spin correlations in YTiO₃ well above T_c.