Abstract
We have determined the ESR properties of U${\mathrm{Be}}_{13}$ doped with dilute local moments of Er, Dy, or Gd over the temperature region where there is a large variation in the enhanced specific heat. We find that neither the enhancement, the temperature variation, nor any other anomalous behavior appears to be mirrored in the ESR data. We suggest that this unexpected result must be incorporated into current models of heavy-fermion systems.
Highlights
We have determined the ESR properties of UBel[3] doped with dilute local moments of Er, Dy, or Gd over the temperature region where there is a large variation in the enhanced specific heat
In a heavy-fermion system where there may be narrow bands of width comparable to kT, and other significant differences from a simple metal host, we would expect that the Korringa relation might no longer be appropriate, but that some aspect of the enhanced p, would be manifested in the temperature dependence of the ESR
From the experimental results to be described, we have concluded that whatever the mechanism is that results in the appreciable temperature dependence of p, it does not appear to be manifested in the spinrelaxation rate of the substituted local moments
Summary
We have determined the ESR properties of UBel[3] doped with dilute local moments of Er, Dy, or Gd over the temperature region where there is a large variation in the enhanced specific heat.
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