Publication : t19/115

Magnetic response of Sr2RuO4: quasi-local spin fluctuations due to Hund's coupling

Strand H. ()
Zingl M. ()
Wentzell N. ()
Parcollet O. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Georges A. ()
Abstract:
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 [P. 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. While all orbitals contribute equally to the incommensurate response, the enhanced Γ point response originates from the planar xy orbital.
Année de publication : 2019
Revue : Phys. Rev. B 100 125120 (2019)
Preprint : arXiv:1904.07324
Keywords : Strongly Correlated Electrons (cond-mat.str-el)
Langue : Anglais

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