4f-electron localization in CexLa 1-xM In5 with M=Co, Rh, or Ir

Phys Rev Lett. 2004 Oct 29;93(18):186405. doi: 10.1103/PhysRevLett.93.186405. Epub 2004 Oct 29.


de Haas-van Alphen measurements on Ce(x)La(1-x)MIn(5) yield contrasting types of behavior that depend on whether M=Co and Ir or M=Rh. A stronger x-dependent scattering in the case of M=Co and Ir is suggestive of a stronger relative coupling, J/W, of the conduction electrons to the 4f electrons, which would then account for the development of a heavy composite Fermi-liquid state as x-->1. The failure of a composite Fermi-liquid state to form for any x in the case of M= Rh is shown to be inconsistent with theoretical models that propose antiferromagnetism to result from spin-density-wave formation.