Effect of rare earth addition on GaAs-based layers grown by liquid phase epitaxy S. I. Krukovsky, V. M. Popov, R. K. Savkina and A. B. Smirnov Eur. Phys. J. Appl. Phys., 27 1-3 (2004) 177-179 Published online: 15 July 2004 DOI: 10.1051/epjap:2004135