Evidence for single-ion spectral response from a strongly hybridised Anderson-lattice: CeRh2

We report measurements of the low-temperature ground-state (F-2(5/2)) paramagnetic spectral response of the compounds CeRh2 and Ce(Rh0.73Pt0.27)(2) Both compounds show broad lorentzian-like, single-ion spectral response with characteristic energies of similar to 114 (+/- 8) and similar to 63 (+/- 5) meV, respectively. The lower magnitude of the characteristic energy for the Pt-doped sample is consistent with the progressive evolution towards the stable valent (i.e. low T-K) state of Ce with increasing Pt content x in the pseudo-binary Ce(Rh1-xPtx)(2). Fermi-liquid relations indicate that the characteristic energies T-K for both compounds are consistent with the linear specific heat coefficient gamma and, to a lesser extent, the low-temperature susceptibility chi(0).