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

CeRhIn$$_5$$におけるLa希釈効果のNMR/NQR法を用いた研究

酒井 宏典  ; 栗田 伸之*; Miclea, C. F.*; Movshovich, R.*; Lee, H.-O.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

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

La希釈効果を(Ce, La)RhIn$$_5$$系において核磁気共鳴(NMR/NQR)法を用いて微視的に調べた。In(1)サイトの4$$nu_{rm Q}$$スペクトル位置から、La 5%程度の希釈によって、Ceから移送される内部磁場は減少することがわかった。これは超微細結合定数が減少したことによるものと見られる。また緩和率測定から、反強磁性秩序状態において、La希釈に伴って、Laサイトに隣接するCeモーメントが局在モーメント的に振る舞っていることがわかった。

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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