High frequency atomic tunneling yields ultralow and glass-like thermal conductivity in chalcogenide single crystals
| العنوان: | High frequency atomic tunneling yields ultralow and glass-like thermal conductivity in chalcogenide single crystals |
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| المؤلفون: | Jaeyun Moon, Nina Shulumba, Raphaël P. Hermann, Barry Winn, Krishnamurthy Mahalingam, Ahmet Alatas, Shanyuan Niu, JoAnna Milam-Guerrero, Bo Sun, Brandon M. Howe, Brent C. Melot, Katharine Page, Rohan Mishra, Michael Manley, Arashdeep Singh Thind, Austin J. Minnich, Young-Dahl Jho, Ralf Haiges, Matthew Mecklenburg, Jayakanth Ravichandran, Boyang Zhao |
| المصدر: | Nature Communications Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020) |
| بيانات النشر: | Nature Publishing Group UK, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Materials science, Phonon, Chalcogenide, Science, General Physics and Astronomy, Physics::Optics, 02 engineering and technology, 01 natural sciences, Condensed Matter::Disordered Systems and Neural Networks, Quantum mechanics, General Biochemistry, Genetics and Molecular Biology, Article, chemistry.chemical_compound, Thermal conductivity, Condensed Matter::Superconductivity, 0103 physical sciences, Atom, Structure of solids and liquids, 010306 general physics, Perovskite (structure), Multidisciplinary, Condensed matter physics, Phonon scattering, General Chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, chemistry, 0210 nano-technology, Single crystal, Materials for energy and catalysis |
| الوصف: | Crystalline solids exhibiting glass-like thermal conductivity have attracted substantial attention both for fundamental interest and applications such as thermoelectrics. In most crystals, the competition of phonon scattering by anharmonic interactions and crystalline imperfections leads to a non-monotonic trend of thermal conductivity with temperature. Defect-free crystals that exhibit the glassy trend of low thermal conductivity with a monotonic increase with temperature are desirable because they are intrinsically thermally insulating while retaining useful properties of perfect crystals. However, this behavior is rare, and its microscopic origin remains unclear. Here, we report the observation of ultralow and glass-like thermal conductivity in a hexagonal perovskite chalcogenide single crystal, BaTiS3, despite its highly symmetric and simple primitive cell. Elastic and inelastic scattering measurements reveal the quantum mechanical origin of this unusual trend. A two-level atomic tunneling system exists in a shallow double-well potential of the Ti atom and is of sufficiently high frequency to scatter heat-carrying phonons up to room temperature. While atomic tunneling has been invoked to explain the low-temperature thermal conductivity of solids for decades, our study establishes the presence of sub-THz frequency tunneling systems even in high-quality, electrically insulating single crystals, leading to anomalous transport properties well above cryogenic temperatures. Defect-free crystals showing the glassy trend of low thermal conductivity with a monotonic increase with temperature are desirable but rare. Here, the authors observe atomic tunneling associated with low and glass-like thermal conductivity in a hexagonal perovskite chalcogenide single-crystal BaTiS3. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2041-1723 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::443dc661df5745574f1d844dd4213ac0 http://europepmc.org/articles/PMC7699621 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....443dc661df5745574f1d844dd4213ac0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20411723 |
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