Nodal gaps from local interactions in Sr${}_2$RuO${}_4$

Abstract

Sr${}_2$RuO${}_4$ has been under intensive scrutiny over the past years after new NMR measurements unveiled that the superconducting state might be a spin singlet. One of the best order parameter candidates in light of these new experiments is a chiral d-wave state with $d_{xz}+i{d}_{yz}$ symmetry. This order parameter has been overlooked given the strong two-dimensional character of the normal state electronic structure. Recently, a phenomenological proposal based on local interactions with a three-dimensional electronic structure showed that a chiral d-wave state can be stable in Sr${}_2$RuO${}_4$ once momentum-dependent spin-orbit coupling is properly taken into account. Here we discuss the origin of the nodes and dips in this order parameter as inherited from the normal state Hamiltonian, showing that a nodal gap can emerge out of purely local interactions and connect the presence of nodes with the superconducting fitness measure.

6 pages, 1 figure. To appear in Journal of Physics: Conference Series (IOP), associated with the SCES 2020/2021 conference

References in corpus (1)

• Bogoliubov Fermi surfaces in superconductors with broken time-reversal symmetry

Cited by in corpus (5)

• Nonunitary Superconductivity in Complex Quantum Materials
• In-plane magnetic penetration depth in Sr${}_2$RuO${}_4$: muon-spin rotation/relaxation study
• Multiple superconducting phases in heavy-fermion metals
• Multipole-fluctuation pairing mechanism of $d_{x^2-y^2}+ig$ superconductivity in Sr${}_2$RuO${}_4$
• Sensitivity of superconducting states to the impurity location in layered materials