Electronic theory for the normal-state spin dynamics in Sr2RuO4: Anisotropy due to spin-orbit coupling
نویسندگان
چکیده
Using a three-band Hubbard Hamiltonian we calculate within the random-phase approximation the spin susceptibility, x(q,v), and nuclear magnetic resonance spin-lattice relaxation rate, 1/T1, in the normal state of the triplet superconductor Sr2RuO4 and obtain quantitative agreement with experimental data. Most importantly, we find that due to spin-orbit coupling the out-of-plane component of the spin susceptibility x becomes at low temperatures two times larger than the in-plane one. As a consequence, strong incommensurate antiferromagnetic fluctuations of the quasi-one-dimensional xz and yz bands point into the z-direction. Our results provide further evidence for the importance of spin fluctuations for triplet superconductivity in Sr2RuO4.
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