{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Henriques A"],"funding":["University Global Partnership Network","Centro Nacional de Pesquisa em Energia e Materiais - CNPEM","Conselho Nacional de Desenvolvimento Científico e Tecnológico","UK International Science Partnerships Fund","Instituto Serrapilheira","Fundação de Amparo à Pesquisa do Estado de São Paulo"],"pagination":["e02379"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12376643"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["12(31)"],"pubmed_abstract":["Unraveling the underlying mechanisms at the origin of ultra-low thermal conductivity in pristine crystals is of central relevance to designing new functional materials. Here, a study of thermal conductivity κ(T) in an extended temperature range (1.5-400 K) is reported in the single-crystalline bismuthate perovskite BaBiO<sub>3</sub>. The measured κ(T) shows an anomalous glass-like behavior with a ≈ T<sup>2</sup> dependence at low temperatures and a plateau in a wide temperature range from about 20 to 260 K, surprisingly recovering the expected downturn for a crystal only for T > 300 K. The measured room temperature κ ≈ 1.6 W m<sup>-1</sup> K<sup>-1</sup> agrees with the calculated value, including three-phonon and isotope disorder scattering. However, the departure of the experimental from the calculated κ(T) for T < 300 K, at the onset of the plateau, indicates that an additional scattering mechanism comes into play at lower temperatures. It is proposed that a tunneling two-level system associated with the BiO<sub>6</sub> octahedra rotation offers an additional phonon scattering mechanism and may explain the observed κ(T) suppression. The findings may have significant implications for the pairing mechanism and unconventional superconductivity of doped-BaBiO<sub>3</sub> aside from suggesting it as a candidate building block for functional heterostructures."],"journal":["Advanced science (Weinheim, Baden-Wurttemberg, Germany)"],"pubmed_title":["Anomalous Glassy Thermal Conductivity in a Perovskite Bismuthate Induced by Structural Dynamic Instability."],"pmcid":["PMC12376643"],"funding_grant_id":["2022/14202-3","402919/2021-1","402919/2021‐1","2022/14202‐3","305726/2023-4","2013/08293‐4","2013/08293-4","201149/2024‐9","201149/2024-9","305726/2023‐4","B2400002","2021/00989‐9","2024/16100-9","R-2401-46983","2024/00177‐2","2024/16100‐9","2022/01742-0","2024/00177-2","2022/01742‐0","20242174","2019/17874‐0","2018/08845-3","2018/08845‐3","2019/17874-0","2021/00989-9","20232019","2018/19420‐3","2018/19420-3"],"pubmed_authors":["Henriques A","Wirth S","Gutmann MJ","Lima MSL","Brito WH","Martelli V","Nilsen GJ"],"additional_accession":[]},"is_claimable":false,"name":"Anomalous Glassy Thermal Conductivity in a Perovskite Bismuthate Induced by Structural Dynamic Instability.","description":"Unraveling the underlying mechanisms at the origin of ultra-low thermal conductivity in pristine crystals is of central relevance to designing new functional materials. Here, a study of thermal conductivity κ(T) in an extended temperature range (1.5-400 K) is reported in the single-crystalline bismuthate perovskite BaBiO<sub>3</sub>. The measured κ(T) shows an anomalous glass-like behavior with a ≈ T<sup>2</sup> dependence at low temperatures and a plateau in a wide temperature range from about 20 to 260 K, surprisingly recovering the expected downturn for a crystal only for T > 300 K. The measured room temperature κ ≈ 1.6 W m<sup>-1</sup> K<sup>-1</sup> agrees with the calculated value, including three-phonon and isotope disorder scattering. However, the departure of the experimental from the calculated κ(T) for T < 300 K, at the onset of the plateau, indicates that an additional scattering mechanism comes into play at lower temperatures. It is proposed that a tunneling two-level system associated with the BiO<sub>6</sub> octahedra rotation offers an additional phonon scattering mechanism and may explain the observed κ(T) suppression. The findings may have significant implications for the pairing mechanism and unconventional superconductivity of doped-BaBiO<sub>3</sub> aside from suggesting it as a candidate building block for functional heterostructures.","dates":{"release":"2025-01-01T00:00:00Z","publication":"2025 Aug","modification":"2026-05-09T19:08:12.706Z","creation":"2026-04-08T01:09:53.795Z"},"accession":"S-EPMC12376643","cross_references":{"pubmed":["40464254"],"doi":["10.1002/advs.202502379"]}}