Anomalous spin fluctuations near the Mott transition in Caz-xSrx RuO_4

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To study spin fluctuations in p-wave superconductor Sr_2RuO_4 which includes no Cu ions, we grow a large single crystal samples, and studied inelastic scattering spectra at the Japanese research reactor JRR-3M in JAERI, Toaki, Japan. The temperature dependence of the inelastic spin fluctuation spectra for 1.3 meV < E < 25 meV was observed and analyzed. The dynamical susceptibility increases below 〜 100K, and shows a sharp drop in the energy spectra. The energy width of the dynamical susceptibility follows a linear relation with temperature, but it accompanies with a large residual width 1 〜 8 meV, indicating its anomalous behavior of spin fluctuations.