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Volume 9
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Article

Simple Model for Tc and Pairing Symmetry Changes in Sr2RuO4 Under (100) Uniaxial Strain

by
Macauley Curtis
1,
Martin Gradhand
1,2 and
James F. Annett
1,*
1
H. H. Wills Physics Laboratory, University of Bristol, Tyndall Ave, Bristol BS8 1TL, UK
2
Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany
*
Author to whom correspondence should be addressed.
Condens. Matter 2024, 9(4), 44; https://doi.org/10.3390/condmat9040044
Submission received: 30 September 2024 / Revised: 17 October 2024 / Accepted: 23 October 2024 / Published: 1 November 2024
(This article belongs to the Special Issue Superstripes Physics, 3rd Edition)
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Abstract

Uniaxial strain in the (100) direction has the effect of increasing the superconducting Tc in Sr2RuO4 from 1.5 K to over 3 K. The enhanced Tc corresponds to a Lifshitz transition in the Fermi surface topology of this unconventional superconductor. We model this using a simple two-dimensional one-band model for the γ sheet of the Fermi surface. This reproduces the experimental Tc results well if we assume a dx2−y2 singlet pairing state. On the other hand, the triplet state px+ipy does not show any distinct peaks in Tc associated with the Lifshitz transition. A mixed symmetry state pairing of the form d+ig can both describe the Tc changes and show a distinct transition temperature for time-reversal symmetry breaking (TRSB).
Keywords: superconductivity; uniaxial strain; unconventional superconductivity superconductivity; uniaxial strain; unconventional superconductivity

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MDPI and ACS Style

Curtis, M.; Gradhand, M.; Annett, J.F. Simple Model for Tc and Pairing Symmetry Changes in Sr2RuO4 Under (100) Uniaxial Strain. Condens. Matter 2024, 9, 44. https://doi.org/10.3390/condmat9040044

AMA Style

Curtis M, Gradhand M, Annett JF. Simple Model for Tc and Pairing Symmetry Changes in Sr2RuO4 Under (100) Uniaxial Strain. Condensed Matter. 2024; 9(4):44. https://doi.org/10.3390/condmat9040044

Chicago/Turabian Style

Curtis, Macauley, Martin Gradhand, and James F. Annett. 2024. "Simple Model for Tc and Pairing Symmetry Changes in Sr2RuO4 Under (100) Uniaxial Strain" Condensed Matter 9, no. 4: 44. https://doi.org/10.3390/condmat9040044

APA Style

Curtis, M., Gradhand, M., & Annett, J. F. (2024). Simple Model for Tc and Pairing Symmetry Changes in Sr2RuO4 Under (100) Uniaxial Strain. Condensed Matter, 9(4), 44. https://doi.org/10.3390/condmat9040044

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