Superconducting penetration depth through a Van Hove singularity: Sr2RuO4 under 
uniaxial stress

Mueller, Eli; Iguchi, Yusuke; Jerzembeck, Fabian; Rodriguez, Jorge O.; Romanelli, Marisa; Abarca-Morales, Edgar; Markou, Anastasios; Kikugawa, Naoki; Sokolov, Dmitry A.; Oh, Gwansuk; Hicks, Clifford W.; Mackenzie, Andrew P.; Maeno, Yoshiteru; Madhavan, Vidya; Moler, Kathryn A.

doi:10.1103/PhysRevB.110.L100502

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Superconducting penetration depth through a Van Hove singularity: Sr₂RuO₄ under uniaxial stress

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

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Abarca-Morales, Edgar
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Markou, Anastasios
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons195519

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

/persons/resource/persons126653

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

/persons/resource/persons126742

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

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Citation

Mueller, E., Iguchi, Y., Jerzembeck, F., Rodriguez, J. O., Romanelli, M., Abarca-Morales, E., et al. (2024). Superconducting penetration depth through a Van Hove singularity: Sr₂RuO₄ under uniaxial stress. Physical Review B, (10): L100502, pp. 1-7. doi:10.1103/PhysRevB.110.L100502.

Cite as: https://hdl.handle.net/21.11116/0000-0010-38D3-1

Abstract

A plethora of experiments in Sr2RuO4 have reached conflicting conclusions about the symmetry of the superconducting gap. To probe the gap's structure in k space, we use strain to continuously tune the band structure through a Van Hove singularity (VHS) while imaging the superconductivity with scanning superconducting quantum interference device microscopy. We find that the superfluid density peaks at the VHS and that the temperature dependence of the penetration depth is T2 quadratic over the entire measured range of strain ɛ. These results are consistent with a gap structure that has vertical line nodes, experimentally confirming that nonlocal effects in the Meissner screening can lead to T2 behavior and clarifying the nature of the low-energy excitations in Sr2RuO4. © 2024 American Physical Society.