Abstract
Magnetic properties in the normal state of spin-triplet superconductor ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ are discussed on the basis of Ru- and O-NMR and neutron-diffraction (ND) measurements reported so far. Besides strong incommensurate antiferromagnetic (IC-AFM) fluctuations probed by the ND measurements, it is shown that q-independent fluctuations are present over a wide temperature range up to 500 K from the comparison between NMR and ND results. From an anisotropy in the nuclear spin lattice relaxation rate ${1/T}_{1}$ at both the Ru and O sites, it was found that the IC-AFM fluctuations are anisotropic so that the out-of-plane component of low-frequency dynamical susceptibility, ${\ensuremath{\chi}}_{IC,out}^{\ensuremath{''}}(q,\ensuremath{\omega})$ is by a factor of $\ensuremath{\sim}3$ larger than the in-plane one, ${\ensuremath{\chi}}_{IC,in}^{\ensuremath{''}}(q,\ensuremath{\omega}).$ These unique characters in magnetic fluctuations are implied to have some relevance for the occurrence of spin-triplet superconductivity.
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