doi:10.1103/PhysRevLett.98.166406engMarcano, N.Gomez Sal, J. C.Espeso, J. I.De Teresa, J. M.Algarabel, P. A.Paulsen, C.Iglesias, J. R.Mesoscopic Magnetic States in Metallic Alloys with Strong Electronic Correlations: A Percolative Scenario for CeNi1-xCuxART-2007-62044We present evidence for the existence of magnetic clusters of approximately 20 Å in the strongly correlated alloy system CeNi1−⁢Cu (0.7≤≤0.2) based on small angle neutron scattering experiments as well as the occurrence of staircaselike hysteresis cycles at very low temperature (100 mK). An unusual feature is the observation of long-range ferromagnetic order below the cluster-glass transition without any indication of a sharp transition at a Curie temperature. These observations strongly support a phenomenological model where a percolative process connects both magnetic states. The model can account for all the puzzling data previously obtained in this system, providing a new perspective with regard to the magnetic ground state of other alloyed compounds with small magnetic moments or weak ferromagnetism with intrinsic disorder effects.2007http://zaguan.unizar.es/record/14517210.1103/PhysRevLett.98.166406http://zaguan.unizar.es/record/145172oai:zaguan.unizar.es:145172Physical Review Letters 98, 16 (2007), 2158-2169All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess