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Dilute La-substitutions in CeRhIn$$_5$$ studied by means of NMR/NQR techniques

Sakai, Hironori  ; Kurita, Nobuyuki*; Miclea, C. F.*; Movshovich, R.*; Lee, H.-O.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

The effect of dilute La substitution in Ce$$_{1-x}$$La$$_{x}$$RhIn$$_{5}$$ (0$$le$$x$$le$$0.07) has been investigated microscopically by nuclear magnetic/quadrupole resonance (NMR/NQR). By the dilute La substitutions, the 4$$nu_{rm Q}$$ lines for In(1) sites are found to be undisturbed and to have a reasonably narrow width, even in the ordered AF state. These 4$$nu_{rm Q}$$ positions in the La-substituted CeRhIn$$_{5}$$ indicate a decrease of the internal field on In(1) sites, due to the reduction of hyperfine couplings by La substitutions. The spin-lattice relaxation rates ($$1/T_{1}$$) using these 4$$nu_{rm Q}$$ lines at high temperatures can be understood by the reduction of exchange energy and effective moments. On the other hand, $$1/T_{1}$$ in the AF ordered state can be explained by a gapped Fermi surface and spin fluctuations of uncompensated localized Ce moments near the La ions.

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