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arXiv · 1806.01511

Multi-orbital nature of the spin fluctuations in Sr$_2$RuO$_4$

Lewin Boehnke·Philipp Werner·Frank Lechermann
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Abstract

The spin susceptibility of strongly correlated Sr$_2$RuO$_4$ is known to display a rich structure in reciprocal space, with a prominent peak at ${\bf Q}_i$=$(0.3,0.3,0)$. It is still debated if the resulting incommensurate spin-density-wave fluctuations foster unconventional superconductivity at low temperature or compete therewith. By means of density functional theory combined with dynamical mean-field theory, we reveal the realistic multi-orbital signature of the (dynamic) spin susceptibility beyond existing weak-coupling approaches. The experimental fluctuation spectrum up to 80 meV is confirmed by theory. Furthermore, the peak at ${\bf Q}_i$ is shown to carry nearly equal contributions from each of the Ru$(4d)$-$t_\mathrm{2g}$ orbitals, pointing to a cooperative effect resulting in the dominant spin fluctuations.

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Lewin Boehnke, Philipp Werner, Frank Lechermann. 2018-06-05. Multi-orbital nature of the spin fluctuations in Sr$_2$RuO$_4$. https://doi.org/10.1209/0295-5075%2F122%2F57001

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