2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/160973An introduction to the physics of heavy fermion compounds is presented, attempting to highlight the conceptual developments and emphasize the mysteries and open questions that persist in this active field of research.This article is a contribution to volume 1 of the Handbook of Magnetism and Advanced Magnetic Materials, to be published by J. Wiley and Sons, 2007. 97 pages double spaced. 36 Figures. YbAgGe + refs added to table of QC metalsStrongly Correlated ElectronsMaterials Sciencetext