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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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引用

Luo, Y., Pustogow, A., Guzman, P., Dioguardi, A. P., Thomas, S. M., Ronning, F., Kikugawa, N., Sokolov, D. A., Jerzembeck, F., Mackenzie, A. P., Hicks, C. W., Bauer, E. D., Mazin, I. I., & Brown, S. E. (2019). Normal State 17O NMR Studies of Sr2RuO4 under Uniaxial Stress. Physical Review X, 9(2):, pp. 1-9. doi:10.1103/PhysRevX.9.021044.


引用: https://hdl.handle.net/21.11116/0000-0003-E04A-D
要旨
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.