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Mesoscopic magnetic states in metallic alloys with strong electronic correlations: A percolative scenario for CeNi1-xCux

AutorMarcano, N.; Gómez Sal, J. C.; Espeso, J. I.; Teresa, José María de; Algarabel, Pedro A. ; Paulsen, C.; Iglesias, J. R.
Fecha de publicaciónabr-2007
EditorAmerican Physical Society
CitaciónPhysical Review Letters 98(16): 166406.1-166406.4 (2007)
ResumenWe present evidence for the existence of magnetic clusters of approximately 20 Å in the strongly correlated alloy system CeNi1-xCux (0.7x0.2) 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.
Descripción4 pages, 4 figures.-- PACS numbers: 71.27.+a, 61.12.Ex, 75.25.+z, 75.60.Ej
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.98.166406
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