Abstract
The effect of dilute La substitution in Ce 1- x La x RhIn 5 (0 ≤ x ≤0.07) has been investigated macroscopically by specific heat measurement and microscopically by nuclear magnetic/quadrupole resonance (NMR/NQR). The Neel temperature decreases gradually by dilute La substitutions from 3.8 K ( x =0) to 2.9 K ( x =0.07). The specific heat for Ce 1- x La x RhIn 5 exhibits nuclear Schottky contributions below 1 K, which are compatible with the microscopic parameters obtained by NMR/NQR. Below the Neel temperature, the residual Sommerfeld coefficient of ∼50 mJ K -2 /mol is nearly independent of increasing La substitution, while the entropy in the ordered state is slightly enhanced. Microscopically, 1/ T 1 in the AF ordered state can be explained by spin-wave term of 4 f moments, spin fluctuation term by uncompensated localized Ce moments near the La ions, and a small Korringa contribution by non-4 f electrons, which suggests a localized 4 f nature in CeRhIn 5 .
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