One-component description of magnetic excitations in the heavy-fermion compound CeIrIn

Kambe, Shinsaku  ; Tokunaga, Yo  ; Sakai, Hironori   ; Chudo, Hiroyuki ; Haga, Yoshinori   ; Matsuda, Tatsuma; Walstedt, R. E.*

We report an In NMR study of a single-crystal sample of the heavy fermion compound CeIrIn. The observed non-linear variation of Knight shift with static susceptibility is consistent with the two-fluid model of Nakatsuji . However, our results can also be understood in terms of a -dependent hyperfine coupling, which accounts for the spin-lattice relaxation data naturally on the basis of a one-component dynamical susceptibility. In addition, the observed -dependence of the hyperfine coupling is scaled to a density of states given by dynamical mean field theory.