Optical indication of metallic clusters in the layered manganites above N. N. Loshkareva, E. V. Mostovshchikova, N. I. Solin, Yu. P. Sukhorukov, S. N. Tugushev and S. V. Naumov Europhys. Lett., 76 5 (2006) 933-937 Published online: 01 November 2006 DOI: 10.1209/epl/i2006-10345-8