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Magnetic response of Sr2RuO4 : Quasi-local spin fluctuations due to Hund's coupling
published on Physical Review B on September 10, 2019
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We study the magnetic susceptibility in the normal state of Sr2RuO4 using dynamical mean-field theory including dynamical vertex corrections. Besides the well-known incommensurate response, our calculations yield quasi-local spin fluctuations which are broad in momentum and centered around the Γ point, in agreement with recent inelastic neutron-scattering experiments [Steffens et al., Phys. Rev. Lett. 122, 047004 (2019)]. We show that these quasi-local fluctuations are controlled by the Hund's coupling and account for the dominant contribution to the momentum-integrated response. Although all orbitals contribute equally to the incommensurate response, the enhanced Γ-point response originates from the planar xy orbital.
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