Photoinduced Coherent Spin Fluctuation in Primary Dynamics of Insulator to Metal Transition in Perovskite Cobalt OxideT. Ishikawa, K. Yamada, H. Itoh, S. Iwai, T. Arima, S. Yamada and T. SasakiEPJ Web of Conferences, 41 (2013) 03013DOI: https://doi.org/10.1051/epjconf/20134103013