%0 Journal Article %1 PhysRevResearch.2.032023 %A Suh, Han Gyeol %A Menke, Henri %A Brydon, P. M. R. %A Timm, Carsten %A Ramires, Aline %A Agterberg, Daniel F. %D 2020 %I American Physical Society %J Phys. Rev. Res. %K a %N 3 %P 032023 %R 10.1103/PhysRevResearch.2.032023 %T Stabilizing even-parity chiral superconductivity in Sr$_2$RuO$_4$ %U https://link.aps.org/doi/10.1103/PhysRevResearch.2.032023 %V 2 %X Strontium ruthenate ($Sr_2RuO_4$) has long been thought to host a spin-triplet chiral p-wave superconducting state. However, the singletlike response observed in recent spin-susceptibility measurements casts serious doubts on this pairing state. Together with the evidence for broken time-reversal symmetry and a jump in the shear modulus c66 at the superconducting transition temperature, the available experiments point towards an even-parity chiral superconductor with kz(kx±iky)-like Eg symmetry, which has consistently been dismissed based on the quasi-two-dimensional electronic structure of $Sr_2RuO_4$. Here, we show how the orbital degree of freedom can encode the two-component nature of the Eg order parameter, allowing for a local orbital-antisymmetric spin-triplet state that can be stabilized by on-site Hund's coupling. We find that this exotic Eg state can be energetically stable once a complete, realistic three-dimensional model is considered, within which momentum-dependent spin-orbit coupling terms are key. This state naturally gives rise to Bogoliubov Fermi surfaces.

@article{PhysRevResearch.2.032023, abstract = {Strontium ruthenate ($Sr_2RuO_4$) has long been thought to host a spin-triplet chiral p-wave superconducting state. However, the singletlike response observed in recent spin-susceptibility measurements casts serious doubts on this pairing state. Together with the evidence for broken time-reversal symmetry and a jump in the shear modulus c66 at the superconducting transition temperature, the available experiments point towards an even-parity chiral superconductor with kz(kx±iky)-like Eg symmetry, which has consistently been dismissed based on the quasi-two-dimensional electronic structure of $Sr_2RuO_4$. Here, we show how the orbital degree of freedom can encode the two-component nature of the Eg order parameter, allowing for a local orbital-antisymmetric spin-triplet state that can be stabilized by on-site Hund's coupling. We find that this exotic Eg state can be energetically stable once a complete, realistic three-dimensional model is considered, within which momentum-dependent spin-orbit coupling terms are key. This state naturally gives rise to Bogoliubov Fermi surfaces.}, added-at = {2021-05-27T09:42:50.000+0200}, author = {Suh, Han Gyeol and Menke, Henri and Brydon, P. M. R. and Timm, Carsten and Ramires, Aline and Agterberg, Daniel F.}, biburl = {https://www.bibsonomy.org/bibtex/24e109aefa29a11299ad75e30eeaca0d4/ctqmat}, day = 21, description = {Phys. Rev. Research 2, 032023(R) (2020) - Stabilizing even-parity chiral superconductivity in ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$}, doi = {10.1103/PhysRevResearch.2.032023}, interhash = {544d05e52ee265c65ed5668eaa1f8f7f}, intrahash = {4e109aefa29a11299ad75e30eeaca0d4}, journal = {Phys. Rev. Res.}, keywords = {a}, month = jul, number = 3, numpages = {6}, pages = 032023, publisher = {American Physical Society}, timestamp = {2023-10-19T13:22:45.000+0200}, title = {Stabilizing even-parity chiral superconductivity in Sr$_{\mathbf{2}}$RuO$_{\mathbf{4}}$}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.032023}, volume = 2, year = 2020 }