Investigation of the optical absorption of a magnetic colloid from the thermal to the electronic time-scale regime: measurement of the free-carrier absorption cross-section - Espinosa, Daniel; Soga, Diogo; Alves, Sarah; De Boni, Leonardo; Zílio, Sérgio Carlos; Figueiredo Neto, Antonio Martins (Journal of the Optical Society of America B, 2012)