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

論文 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

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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. Superconducting penetration depth through a Van Hove singularity: Sr2RuO4 under uniaxial stress. Physical Review B. 2024, 110 (10), L100502.

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(abstract)

In the unconventional superconductor Sr2RuO4, uniaxial stress along the [100] direction tunes the Fermi level through a Van Hove singularity (VHS) in the density of states, causing a strong enhancement of the superconducting critical temperature Tc. Here, we report measurements of the London penetration depth λ as this tuning is performed. We find that the zero-temperature superfluid density, here defined as λ(0)^(−2), increases by ∼15%, with a peak that coincides with the peak in Tc. We also find that the low temperature form of λ(T) is quadratic over the entire strain range. Using scanning tunneling microscopy, we find that the gap increases from ∆(0) ≈ 350 μeV in unstressed Sr2RuO4 to ∆(0) ≈ 600 μeV in a sample strained to near the peak in Tc. With a nodal order parameter, an increase in the superconducting gap could bring about an increase in the superfluid density through reduced sensitivity to defects and through reduced non-local effects in the Meissner screening. Our data indicate that tuning to the VHS increases the gap throughout the Brillouin zone, and that non-local effects are likely more important than reduced scattering.

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