Superconducting penetration depth through a Van Hove singularity: <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>Sr</mi><mn>2</mn></msub><msub><mi>RuO</mi><mn>4</mn></msub></mrow></math> 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

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Letter

Superconducting penetration depth through a Van Hove singularity: ${Sr}_{2} {RuO}_{4}$ under uniaxial stress

Eli Mueller ^1,2, Yusuke Iguchi^1,3, Fabian Jerzembeck ⁴, Jorge O. Rodriguez⁵, Marisa Romanelli ⁵, Edgar Abarca-Morales⁴, Anastasios Markou^4,6, Naoki Kikugawa⁷, Dmitry A. Sokolov⁴ et al.

Gwansuk Oh^8,9, Clifford W. Hicks^4,10, Andrew P. Mackenzie^4,11, Yoshiteru Maeno^8,12, Vidya Madhavan⁵, and Kathryn A. Moler ^1,2,3

¹Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
²Department of Physics, Stanford University, Stanford, California 94305, USA
³Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
⁴Max Planck Institute for the Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
⁵Department of Physics, University of Illinois, Urbana, Illinois 61801, USA
⁶Department of Physics, University of Ioannina, 45110 Ioannina, Greece
⁷National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
⁸Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
⁹Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
¹⁰School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
¹¹Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
¹²Toyota Riken - Kyoto University Research Center (TRiKUC), Kyoto University, Kyoto 606-8501, Japan

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Phys. Rev. B 110, L100502 – Published 17 September, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.L100502

Abstract

A plethora of experiments in ${Sr}_{2} {RuO}_{4}$ 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 $T^{2}$ 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 $T^{2}$ behavior and clarifying the nature of the low-energy excitations in ${Sr}_{2} {RuO}_{4}$ .

Physical Review B

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Superconducting penetration depth through a Van Hove singularity: ${Sr}_{2} {RuO}_{4}$ under uniaxial stress

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Evidence for vertical line nodes in ${Sr}_{2} {RuO}_{4}$ from nonlocal electrodynamics

Nonlocal electrodynamics and the penetration depth of superconducting ${Sr}_{2} {RuO}_{4}$

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

Abstract

Physics Subject Headings (PhySH)

See Also

Evidence for vertical line nodes in Sr2RuO4 from nonlocal electrodynamics

Nonlocal electrodynamics and the penetration depth of superconducting Sr2RuO4

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Superconducting penetration depth through a Van Hove singularity: ${Sr}_{2} {RuO}_{4}$ under uniaxial stress

Evidence for vertical line nodes in ${Sr}_{2} {RuO}_{4}$ from nonlocal electrodynamics

Nonlocal electrodynamics and the penetration depth of superconducting ${Sr}_{2} {RuO}_{4}$