@article{ecc4c5ef0c8f4db1b1bbcef23269a26b,
title = "Superconducting penetration depth through a Van Hove singularity: Sr2RuO4 under uniaxial stress",
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.",
author = "Eli Mueller and Yusuke Iguchi and Fabian Jerzembeck and Rodriguez, {Jorge O.} and Marisa Romanelli and Edgar Abarca-Morales and Anastasios Markou and Naoki Kikugawa and Sokolov, {Dmitry A.} and Gwansuk Oh and Hicks, {Clifford W.} and Mackenzie, {Andrew P.} and Yoshiteru Maeno and Vidya Madhavan and Moler, {Kathryn A.}",
note = "This work was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract No. DE-AC02-76SF00515. N.K. is supported by JSPS KAKENHI (No. JP18K04715, No. JP21H01033, and No. JP22K19093). Y.M. was supported by JSPS KAKENHI (No. JP15H05851 and No. JP22H01168). G.S.O. was supported by JSPS KAKENHI (No. JP15H05851 and No. JP15K21717) during his stay at Kyoto University. F.J., A.P.M., and C.W.H. acknowledge the support of the Max Planck Society and the German Research Foundation (TRR288-422213477 ELASTO-Q-MAT, Project No. A10). Research in Dresden benefits from the environment provided by the DFG Cluster of Excellence (ct.qmat EXC 2147, Project No. 390858490. C.W.H. acknowledges support from the Engineering and Physical Sciences Research Council (UK) (EP/X012158/1). This work was supported by the Center for Quantum Sensing and Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0021238. We acknowledge useful conversations with J. Landaeta and E. Hassinger.",
year = "2024",
month = sep,
day = "1",
doi = "10.1103/PhysRevB.110.L100502",
language = "English (US)",
volume = "110",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "10",
}