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  The magic angle of Sr2RuO4: optimizing correlation-driven superconductivity

Profe, J. B., Rhodes, L. C., Dürrnagel, M., Bisset, R., Marques, C. A., Chi, S., et al. (2024). The magic angle of Sr2RuO4: optimizing correlation-driven superconductivity.

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2405.14926.pdf (Preprint), 10MB
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https://arxiv.org/abs/2405.14926 (Preprint)
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 Creators:
Profe, J. B.1, 2, Author
Rhodes, L. C.3, Author
Dürrnagel, M.4, 5, Author
Bisset, R.3, Author
Marques, C. A.6, Author
Chi, S.7, 8, Author
Schwemmer, T.4, Author
Thomale, R.4, Author
Kennes, D. M.2, 9, 10, Author           
Hooley, C.11, Author
Wahl, P.3, 12, Author
Affiliations:
1Institute for Theoretical Physics, Goethe University Frankfurt, ou_persistent22              
2Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA—Fundamentals of Future Information Technology, ou_persistent22              
3SUPA, School of Physics and Astronomy, University of St Andrews, ou_persistent22              
4Institute for Theoretical Physics and Astrophysics, University of Würzburg, ou_persistent22              
5Institute for Theoretical Physics, ETH Zürich, ou_persistent22              
6Physik-Institut, Universität Zürich, ou_persistent22              
7Department of Physics and Astronomy, University of British Columbia, ou_persistent22              
8Stewart Blusson Quantum Matter Institute, University of British Columbia, ou_persistent22              
9Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
10Center for Free-Electron Laser Science, ou_persistent22              
11Max Planck Institute for the Physics of Complex Systems, ou_persistent22              
12Physikalisches Institut, Universität Bonn, ou_persistent22              

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Free keywords: Condensed Matter, Superconductivity, cond-mat.supr-con, Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el
 Abstract: A fundamental understanding of unconventional superconductivity is crucial for engineering materials with specific order parameters or elevated superconducting transition temperatures. However, for many of these materials, such as Sr2RuO4, the pairing mechanism and the symmetry of the superconducting order parameter remain unclear; furthermore, reliable and efficient methods of predicting their response to tuning - e.g. via structural distortions through strain and octahedral rotations - are lacking. Here we investigate the response of superconductivity in Sr2RuO4 to distortions via two numerical techniques, the random phase approximation (RPA) and functional renormalization group (FRG), starting from realistic models of the electronic structure. Comparison of the results from the two techniques suggests that RPA misses the important interplay of competing fluctuation channels, while FRG reproduces key experimental findings. In accordance with earlier studies by RPA and FRG, we confirm the experimentally observed tuneability of Tc with uniaxial strain. With octahedral rotation, we find an even larger increase of Tc before superconductivity is completely suppressed in FRG, a finding that confirms experiments but is not reproduced in RPA. Throughout the parameter space investigated here, we find a dominant dx2y2 pairing symmetry from FRG. To provide benchmark results for determining the pairing symmetry experimentally by quasiparticle interference using a Scanning Tunneling Microscope, we introduce the pairing interactions into continuum local density of states calculations, enabling experimental verification of the symmetry of the order parameter via phase-referenced Bogoliubov Quasiparticle Interference imaging.

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Language(s): eng - English
 Dates: 2024-05-23
 Publication Status: Published online
 Pages: 47
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2405.14926
 Degree: -

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