Additional phonon scattering channels provided by one-dimensional heavy double-chain rattlers in quasi-one-dimensional perovskite δ−CsSnI3RemoveRu Yu, Feng Xiao, Qing-Yu Xie, Wen Lei, Huazhong Guo, Bao-Tian Wang, and Xing MingPhys. Rev. B 113, 184311 (2026)
