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Liquid-like thermal conduction in intercalated layered crystalline solids

TitleLiquid-like thermal conduction in intercalated layered crystalline solids
Publication TypeJournal Article
Year of Publication2018
AuthorsLi, B, Wang, H, Kawakita, Y, Zhang, Q, Feygenson, M, Yu, HL, Wu, D, Ohara, K, Kikuchi, T, Shibata, K, Yamada, T, Ning, XK, Chen, Y, He, JQ, Vaknin, D, Wu, RQ, Nakajima, K, Kanatzidis, MG
JournalNature Materials
Date Published03
Type of ArticleArticle
ISBN Number1476-1122
Accession NumberWOS:000426012000010
Keywordsagcrse2, augmented-wave method, chemistry, dynamics, Materials Science, modes, order-disorder transition, physics, scattering, snse, thermoelectrics

As a generic property, all substances transfer heat through microscopic collisions of constituent particles1. A solid conducts heat through both transverse and longitudinal acoustic phonons, but a liquid employs only longitudinal vibrations2,3. As a result, a solid is usually thermally more conductive than a liquid. In canonical viewpoints, such a difference also serves as the dynamic signature distinguishing a solid from a liquid. Here, we report liquid-like thermal conduction observed in the crystalline AgCrSe2. The transverse acoustic phonons are completely suppressed by the ultrafast dynamic disorder while the longitudinal acoustic phonons are strongly scattered but survive, and are thus responsible for the intrinsically ultralow thermal conductivity. This scenario is applicable to a wide variety of layered compounds with heavy intercalants in the van der Waals gaps, manifesting a broad implication on suppressing thermal conduction. These microscopic insights might reshape the fundamental understanding on thermal transport properties of matter and open up a general opportunity to optimize performances of thermoelectrics.

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