Normal state ${}^{17}$O NMR studies of Sr${}_2$RuO${}_4$ under uniaxial stress

Abstract

The effects of uniaxial compressive stress on the normal state ${}^{17}$O nuclear magnetic resonance properties of the unconventional superconductor Sr${}_2$RuO${}_4$ are reported. The paramagnetic shifts of both planar and apical oxygen sites show pronounced anomalies near the nominal $\mathbf{a}$-axis strain ${\epsilon }_{aa}\equiv {\epsilon }_v$, that maximizes the superconducting transition temperature, $T_c$. The spin susceptibility weakly increases on lowering the temperature below $T$$\simeq$10 K, consistent with an enhanced density of states associated with passing the Fermi energy through a van Hove singularity. Although such a Lifshitz transition occurs in the $\gamma$ band, formed by the Ru $d_{xy}$ states hybridized with in-plane O $p_{\pi }$ orbitals, the large Hund's coupling renormalizes the uniform spin susceptibilty, which, in turn, affects the hyperfine fields of all nuclei. We estimate this \textquotedblleft Stoner\textquotedblright\ renormalization, $S,$ by combining the data with first-principles calculations and conclude that this is an important part of the strain effect, with implications for superconductivity.

arXiv comment15 pages, 9+6 figures, 0+1 table

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Cited by in corpus (21)

• Pronounced drop of ${}^{17}$O NMR Knight shift in superconducting state of Sr${}_2$RuO${}_4$
• Evidence for even parity unconventional superconductivity in Sr${}_2$RuO${}_4$
• Elastocaloric determination of the phase diagram of Sr${}_2$RuO${}_4$
• Classification of Critical Points in Energy Bands Based on Topology, Scaling and Symmetry
• Reduction of the spin susceptibility in the superconducting state of Sr2RuO4 observed by polarized neutron scattering
• Supermetal
• A key role of correlation effects in the Lifshitz transition in Sr${}_2$RuO${}_4$
• Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance
• Spin gap and L modulated intensity at the low-energy incommensurate magnetic fluctuations in the superconducting state of Sr2RuO4
• Interplay between spin-orbit coupling and van Hove singularity in the Hund's metallicity of Sr${}_2$RuO${}_4$
• Controlling frustrated magnetism on the kagome lattice by uniaxial-strain tuning
• Heat-capacity measurements under uniaxial pressure using a piezo-driven device
• Suppressed fluctuations as the origin of the static magnetic order in strained Sr${}_2$RuO${}_4$
• Sr${}_2$RuO${}_4$, like doped cuprates and barium bismuthate, is a negative charge-transfer gap even parity superconductor with $\frac{3}{4}$-filled oxygen band
• Upper Critical Field of Sr${}_2$RuO${}_4$ under In-Plane Uniaxial Pressure
• SrRuO${}_3$-SrTiO${}_3$ heterostructure as a possible platform for studying unconventional superconductivity in Sr${}_2$RuO${}_4$
• Effect of strain inhomogeneity on a chiral p-wave superconductor
• Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr${}_2$RuO${}_4$
• $T_c$ and Pauli limited critical field of ${\text{Sr}}_2\text{Ru}{\text{O}}_4$: uniaxial strain dependence
• Influence of Fermi Surface Geometry and Van Hove Singularities on the Optical Response of Sr${}_2$RuO${}_4$
• Anisotropic scattering rates in strain-tuned Sr${}_2$RuO${}_4$