Ultrafast spin crossover in a single crystal Ryan L. Field, Lai Chung Liu, Yifeng Jiang, Wojciech Gawelda, Cheng Lu and R. J. Dwayne Miller EPJ Web Conf., 205 (2019) 07009 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920507009