Journal
PHYSICAL REVIEW LETTERS
Volume 93, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.186405
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de Haas-van Alphen measurements on CexLa1-xMIn5 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.
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