Photothermal measurement of thermal diffusivity in carbonyl iron powder suspensions R. Medina-Esquivel, J. M. Yáñez-Limón and J. J. Alvarado-Gil Eur. Phys. J. Special Topics, 153 (2008) 75-77 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00396-5