Abstract
We analyze the magnetic susceptibility in the triplet-pairing state of Sr 2RuO 4, assuming the chiral p-wave state d ( k ) ∼ ( k x + i k y ) z ^ . The article consists of two separate parts. In the first part we use the random phase approximation, starting from a three-band repulsive Hubbard model, and calculate the NMR relaxation rate ( 1 / T 1 ) as a function of temperature. In the second part we use another model containing effective triplet-pairing interaction, and discuss possible collective spin excitation in the long-wavelength region. In the both parts we take full account of the realistic multi-band electronic structure of Sr 2RuO 4, and use the superconducting gap determined microscopically from the electron correlation effect.
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