Molecular dynamics of cis-polybutadiene across the glass transition revealed by muonated-radical spin relaxationRemoveS. Takeshita, H. Okabe, M. Hiraishi, K. M. Kojima, A. Koda, H. Seto, T. Masui, N. Wakabayashi, F. L. Pratt, and R. KadonoPhys. Rev. B 111, 214208 (2025)