Article Lattice softening and diffusive dynamics in the polar metal LiReO 3

Kantaro Murayama ORCID ; Ryota Masuki ORCID ; Cédric Tassel ORCID ; Hideaki Sakai ORCID ; Tatsuya Yanagisawa ORCID ; Keito Yoshida ; Hiroshi Oike SAMURAI ORCID ; Suguru Yoshida ORCID ; Xiangyu Gu ; Kohdai Ishida ORCID ; Morito Namba ORCID ; Ksenia Denisova ORCID ; Valérie Dupray ; Simon Clevers ORCID ; Olivier Mentré ORCID ; Takuya Nomoto ORCID ; Terumasa Tadano SAMURAI ORCID ; Craig M. Brown ORCID ; Peter Lemmens ORCID ; Ryotaro Arita ORCID ; Hiroshi Takatsu ORCID ; Hiroshi Kageyama ORCID

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Kantaro Murayama, Ryota Masuki, Cédric Tassel, Hideaki Sakai, Tatsuya Yanagisawa, Keito Yoshida, Hiroshi Oike, Suguru Yoshida, Xiangyu Gu, Kohdai Ishida, Morito Namba, Ksenia Denisova, Valérie Dupray, Simon Clevers, Olivier Mentré, Takuya Nomoto, Terumasa Tadano, Craig M. Brown, Peter Lemmens, Ryotaro Arita, Hiroshi Takatsu, Hiroshi Kageyama. Lattice softening and diffusive dynamics in the polar metal LiReO 3. Science Advances. 2026, 12 (14), eadt3886. https://doi.org/10.1126/sciadv.adt3886

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(abstract)

Polar metals, characterized by the nontrivial coexistence of metallicity and polar structural order, define an emerging frontier in quantum materials research. Yet, the interplay between their structural phase transitions and fluctuation dynamics remains poorly understood. Here, we reveal distinct diffusive dynamics in metallic LiReO3 associated with its polar-to-nonpolar (P-NP) transition. Unlike isostructural LiOsO3 and related systems, LiReO3 exhibits pronounced phase fluctuations both above and below Ts. Thermoelectric, Raman, and ultrasound measurements demonstrate a probe-dependent thermal hysteresis, while ultrasound data further show lattice softening and persistent resonant absorption at low temperatures across a broad timescale (1-100 μs). These observations indicate a multiscale spatiotemporal dynamics governed by a shallow anharmonic potential stabilized by itinerant electrons, as supported by finite temperature first-principles calculations. By mapping the fluctuation landscape shaped by itinerant electrons, this work offers a new perspective for exploiting fluctuation-driven phenomena in polar metals.

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Keyword: Polar metal, lattice dynamics, phase transition

Date published: 2026-04-03

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

  • Science Advances (ISSN: 23752548) vol. 12 issue. 14 eadt3886

Funding:

  • Nippon Sheet Glass Foundation for Materials Science and Engineering
  • Deutsche Forschungsgemeinschaft 390837967
  • Japan Society for the Promotion of Science JP22H04914
  • Japan Society for the Promotion of Science JP16H06439
  • Japan Society for the Promotion of Science JP21H05561
  • Japan Society for the Promotion of Science JP22H05143
  • Japan Society for the Promotion of Science JP23H04868
  • Japan Society for the Promotion of Science JP22H01777
  • Japan Society for the Promotion of Science JSPSCCA20200004
  • Japan Society for the Promotion of Science JP23KJ1395
  • Japan Society for the Promotion of Science JP22H04914
  • Japan Science and Technology Agency JPMJCR1421
  • Japan Science and Technology Agency JPMJAP2408
  • Japan Science and Technology Agency JPMJCR2543
  • Japan Society for the Promotion of Science JP24K01583
  • Japan Society for the Promotion of Science JP22H04914
  • Japan Science and Technology Agency JPMJCR2543
  • Japan Science and Technology Agency JPMJAP2408
  • Japan Society for the Promotion of Science JP22KJ1028

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1126/sciadv.adt3886

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Updated at: 2026-04-07 10:28:05 +0900

Published on MDR: 2026-04-07 16:24:27 +0900

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