Photoacoustic study of the effect of Mn ion concentration on the thermal diffusivity of Zn1 - xMnxIn2Se4 mono-crystals J.E. Morales, R. Saavedra, A. Cruz-Orea et V. Sagredo J. Phys. IV France, 125 (2005) 285-287 DOI: 10.1051/jp4:2005125068