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Article Dans Une Revue Physical Review B Année : 2019

Magnetic response of Sr$_2$RuO$_4$ : quasi-local spin fluctuations due to Hund's coupling

Résumé

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 momentumintegrated response. While all orbitals contribute equally to the incommensurate response, the enhanced Γ point response originates from the planar xy orbital.
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cea-04541097 , version 1 (10-04-2024)

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Hugo Strand, Manuel Zingl, Nils Wentzell, Olivier Parcollet, Antoine Georges. Magnetic response of Sr$_2$RuO$_4$ : quasi-local spin fluctuations due to Hund's coupling. Physical Review B, 2019, 100 (12), pp.125120. ⟨10.1103/PhysRevB.100.125120⟩. ⟨cea-04541097⟩
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