NMR investigation of spin fluctuations in the itinerant-electron magnetic compound

Imai, Masaki  ; Michioka, Chishiro*; Ueda, Hiroaki*; Yoshimura, Kazuyoshi*

We took P NMR measurements of mainly paramagnetic phase to reveal the itinerant-electron metamagnetic transition, and of its magnetically ordered phase, and characterized their spin fluctuations by estimating the spin fluctuation parameter corresponding to the width of the spin fluctuation in the spectrum in frequency space. As increases from 0 to 0.5, the in-plane component of decreases proportionally with the metamagnetic transition field. In the antiferromagnetic cT phase, is constant and spin fluctuations show an isotropic character in contrast to their behavior in the paramagnetic ucT phase. These results indicate that the in-plane spin fluctuations due to the quasi-two-dimensional crystal structure play a significant role in the metamagnetic transition of this system.