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

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

doi:10.1103/PhysRevB.110.L100502

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

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

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	L100502
Journal	Physical Review B
Volume	110
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.110.L100502
State	Published - Sep 1 2024

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Mueller, E., Iguchi, Y., Jerzembeck, F., Rodriguez, J. O., Romanelli, M., Abarca-Morales, E., Markou, A., Kikugawa, N., Sokolov, D. A., Oh, G., Hicks, C. W., Mackenzie, A. P., Maeno, Y., Madhavan, V., & Moler, K. A. (2024). Superconducting penetration depth through a Van Hove singularity: Sr2RuO4 under uniaxial stress. Physical Review B, 110(10), Article L100502. https://doi.org/10.1103/PhysRevB.110.L100502

Mueller, E, Iguchi, Y, Jerzembeck, F, Rodriguez, JO, Romanelli, M, Abarca-Morales, E, Markou, A, Kikugawa, N, Sokolov, DA, Oh, G, Hicks, CW, Mackenzie, AP, Maeno, Y, Madhavan, V & Moler, KA 2024, 'Superconducting penetration depth through a Van Hove singularity: Sr2RuO4 under uniaxial stress', Physical Review B, vol. 110, no. 10, L100502. https://doi.org/10.1103/PhysRevB.110.L100502

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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.",

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AU - Mueller, Eli

AU - Iguchi, Yusuke

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AU - Rodriguez, Jorge O.

AU - Romanelli, Marisa

AU - Abarca-Morales, Edgar

AU - Markou, Anastasios

AU - Kikugawa, Naoki

AU - Sokolov, Dmitry A.

AU - Oh, Gwansuk

AU - Hicks, Clifford W.

AU - Mackenzie, Andrew P.

AU - Maeno, Yoshiteru

AU - Madhavan, Vidya

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

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