Superconducting Instability From Spin Fluctuations in Sr<sub>2</sub>RuO<sub>4</sub>

The symmetry of the superconducting condensate in Sr₂RuO₄ remains controversial after recent experiments overturned the dominant chiral p-wave paradigm: NMR leaves almost no room for a triplet component and ultrasound experiments put very stringent constraints on the superconducting order parameter which is deemed to comprise two components[1,2,3]. At the same time, specific heat finds no evidence for a split transition under uniaxial strain [4] in sharp contrast to the findings of muon spin rotation[5].

We explore which superconducting order parameters are favorable from the perspective of spin-fluctuation mediated pairing, taking into account the three Ru orbitals, a sizable spin-orbit coupling, longer range Coulomb interaction as well as three-dimensional effects. A full self-consistent solution of the gap sheds light on the propensity to time-reversal breaking superconducting order based on the near-degeneracy of symmetry-distinct pairing states and we will discuss effects due to strain and impurities.

[1] A. Pustogow et al., Nature 574, 72 (2019)

[2] S. Ghosh et al., Nat. Phys. 17, 199 (2021)

[3] S. Benhabib et al., Nat. Phys. 17, 194 (2021)

[4] Y.-S. Li et al, PNAS 118, 10 (2021)

[5] V. Grinenko et al, Nat. Phys. 17, 748 (2021)

About APS

The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.

Headquarters 1 Physics Ellipse, College Park, MD 20740-3844 (301) 209-3200
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700

Bulletin of the American Physical Society

APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session F57: Superconductivity: Unconventional Theories I

Abstract: F57.00011 : Superconducting Instability From Spin Fluctuations in Sr2RuO4

Presenter:

Authors:

Follow Us

Engage

My APS

Information for

About APS

Abstract: F57.00011 : Superconducting Instability From Spin Fluctuations in Sr₂RuO₄