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Normal State 17O NMR Studies of Sr2RuO4 under Uniaxial Stress

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Sokolov,  D. A.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Jerzembeck,  F.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mackenzie,  A. P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hicks,  C. W.
Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Luo, Y., Pustogow, A., Guzman, P., Dioguardi, A. P., Thomas, S. M., Ronning, F., et al. (2019). Normal State 17O NMR Studies of Sr2RuO4 under Uniaxial Stress. Physical Review X, 9(2): 021044, pp. 1-9. doi:10.1103/PhysRevX.9.021044.


Cite as: http://hdl.handle.net/21.11116/0000-0003-E04A-D
Abstract
The effects of uniaxial compressive stress on the normal state O-17 nuclear-magnetic-resonance properties of the unconventional superconductor Sr2RuO4 are reported. The paramagnetic shifts of both planar and apical oxygen sites show pronounced anomalies near the nominal a-axis strain epsilon(aa) (math) epsilon(v) that maximizes the superconducting transition temperature T-c. The spin susceptibility weakly increases on lowering the temperature below T similar or equal to 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 susceptibility, which, in turn, affects the hyperfine fields of all nuclei. We estimate this "Stoner" 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.