Superconducting penetration depth through a Van Hove singularity: Sr2⁢RuO4 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

Title: Superconducting penetration depth through a Van Hove singularity: Sr₂⁢RuO₄ under uniaxial stress

Journal Article · 16 September 2024 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.110.l100502 · OSTI ID:2447416

^[1]; Iguchi, Yusuke ^[2];

^[3]; Rodriguez, Jorge O. ^[4];

^[4]; Abarca-Morales, Edgar ^[3]; Markou, Anastasios ^[5]; Kikugawa, Naoki ^[6]; Sokolov, Dmitry A. ^[3]; Oh, Gwansuk ^[7]; Hicks, Clifford W. ^[8]; Mackenzie, Andrew P. ^[9]; Maeno, Yoshiteru ^[10]; Madhavan, Vidya ^[4];

^[2]

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States); SLAC
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)
Max Planck Institute for the Chemical Physics of Solids, Dresden (Germany)
University of Illinois, Urbana, IL (United States)
Max Planck Institute for the Chemical Physics of Solids, Dresden (Germany); University of Ioannina (Greece)
National Institute for Materials Science, Ibaraki (Japan)
Kyoto University (Japan); Pohang University of Science and Technology (POSTECH) (Korea, Republic of)
Max Planck Institute for the Chemical Physics of Solids, Dresden (Germany); University of Birmingham (United Kingdom)
Max Planck Institute for the Chemical Physics of Solids, Dresden (Germany); University of St. Andrews (United Kingdom)
Kyoto University (Japan)

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 SQUID 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 ε. These results are consistent with a gap structure that has vertical line nodes, experimentally confirming that non-local 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515; SC0021238

OSTI ID:: 2447416

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 110; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Superconducting penetration depth through a Van Hove singularity: Sr2⁢RuO4 under uniaxial stress

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Title: Superconducting penetration depth through a Van Hove singularity: Sr₂⁢RuO₄ under uniaxial stress