{"article_processing_charge":"No","month":"02","date_updated":"2024-03-04T07:48:55Z","type":"journal_article","day":"14","department":[{"_id":"BiCh"}],"abstract":[{"lang":"eng","text":"Substrate induces mechanical strain on perovskite devices, which can result in alterations to its lattice dynamics and thermal transport. Herein, we have performed a theoretical investigation on the anharmonic lattice dynamics and thermal property of perovskite Rb2SnBr6 and Cs2SnBr6 under strains using perturbation theory up to the fourth-order terms and the unified thermal transport theory. We demonstrate a pronounced hardening of low-frequency optical phonons as temperature increases, indicating strong lattice anharmonicity and the necessity of adopting temperature-dependent interatomic force constants in the lattice thermal conductivity (\r\nκL) calculations. It is found that the low-lying optical phonon modes of Rb2SnBr6 are extremely soft and their phonon energies are almost strain independent, which ultimately lead to a lower \r\nκL and a weaker strain dependence than Cs2SnBr6. We further reveal that the strain dependence of these phonon modes in the A2XB6-type perovskites weakens as their ibrational frequency decreases. This study deepens the understanding of lattice thermal transport in perovskites A2XB6 and provides a perspective on the selection of materials that meet the expected thermal behaviors in practical applications."}],"date_published":"2024-02-14T00:00:00Z","publication_status":"published","issue":"5","publisher":"American Physical Society","scopus_import":"1","oa_version":"None","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2024-03-04T07:41:23Z","title":"Impact of strain-insensitive low-frequency phonon modes on lattice thermal transport in AxXB6-type perovskites","quality_controlled":"1","status":"public","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"author":[{"first_name":"Ruihuan","last_name":"Cheng","full_name":"Cheng, Ruihuan"},{"id":"54a2c730-803f-11ed-ab7e-95b29d2680e7","full_name":"Zeng, Zezhu","last_name":"Zeng","first_name":"Zezhu"},{"last_name":"Wang","first_name":"Chen","full_name":"Wang, Chen"},{"last_name":"Ouyang","first_name":"Niuchang","full_name":"Ouyang, Niuchang"},{"first_name":"Yue","last_name":"Chen","full_name":"Chen, Yue"}],"publication":"Physical Review B","doi":"10.1103/physrevb.109.054305","_id":"15052","article_number":"054305","language":[{"iso":"eng"}],"article_type":"original","citation":{"apa":"Cheng, R., Zeng, Z., Wang, C., Ouyang, N., &#38; Chen, Y. (2024). Impact of strain-insensitive low-frequency phonon modes on lattice thermal transport in AxXB6-type perovskites. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.109.054305\">https://doi.org/10.1103/physrevb.109.054305</a>","chicago":"Cheng, Ruihuan, Zezhu Zeng, Chen Wang, Niuchang Ouyang, and Yue Chen. “Impact of Strain-Insensitive Low-Frequency Phonon Modes on Lattice Thermal Transport in AxXB6-Type Perovskites.” <i>Physical Review B</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/physrevb.109.054305\">https://doi.org/10.1103/physrevb.109.054305</a>.","ista":"Cheng R, Zeng Z, Wang C, Ouyang N, Chen Y. 2024. Impact of strain-insensitive low-frequency phonon modes on lattice thermal transport in AxXB6-type perovskites. Physical Review B. 109(5), 054305.","ama":"Cheng R, Zeng Z, Wang C, Ouyang N, Chen Y. Impact of strain-insensitive low-frequency phonon modes on lattice thermal transport in AxXB6-type perovskites. <i>Physical Review B</i>. 2024;109(5). doi:<a href=\"https://doi.org/10.1103/physrevb.109.054305\">10.1103/physrevb.109.054305</a>","short":"R. Cheng, Z. Zeng, C. Wang, N. Ouyang, Y. Chen, Physical Review B 109 (2024).","mla":"Cheng, Ruihuan, et al. “Impact of Strain-Insensitive Low-Frequency Phonon Modes on Lattice Thermal Transport in AxXB6-Type Perovskites.” <i>Physical Review B</i>, vol. 109, no. 5, 054305, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/physrevb.109.054305\">10.1103/physrevb.109.054305</a>.","ieee":"R. Cheng, Z. Zeng, C. Wang, N. Ouyang, and Y. Chen, “Impact of strain-insensitive low-frequency phonon modes on lattice thermal transport in AxXB6-type perovskites,” <i>Physical Review B</i>, vol. 109, no. 5. American Physical Society, 2024."},"ec_funded":1,"year":"2024","intvolume":"       109","volume":109,"project":[{"name":"IST-BRIDGE: International postdoctoral program","_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c","grant_number":"101034413","call_identifier":"H2020"}],"acknowledgement":"This work is supported by the Research Grants Council of Hong Kong (C7002-22Y and 17318122). The authors are grateful for the research computing facilities offered by\r\nITS, HKU. Z.Z. acknowledges the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 101034413."}