Abstract
From the 17 O Knight shift measurements on O(1) in RuO 2 planes and O(2) in SrO layers in Sr 2RuO 4 with T c =1.5 K , it is shown that the distribution of the spin density at the O(1) sites reflects two-dimensional electronic structure with most of its fraction on the in-plane p π orbitals. From systematic measurements of the nuclear spin-lattice relaxation rate, T −1 1, it is found that dynamical susceptibility is highly anisotropic in contrast to the uniform susceptibility being isotropic. Their in-plane components for the O(1) sites are almost independent of wavenumber although they are exchange-enhanced, whereas it is unexpected that the out-of-plane component being q dependent is pronouncedly enhanced by interlayer antiferromagnetic spin fluctuations below T ∗∼130 K where the c-axis resistivity shows a metallic behavior. These novel characters of spin fluctuations are suggested to lead to discussions about a possible mechanism of spin-triplet p-wave superconductivity in Sr 2RuO 4.
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