Stabilizing Even-Parity Chiral Superconductivity in Sr$_2$RuO$_4$
| Autor: | Carsten Timm, Han Gyeol Suh, P. M. R. Brydon, Daniel F. Agterberg, Henri Menke, Aline Ramires |
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| Přispěvatelé: | University of Wisconsin, University of Otago, Technische Universität Dresden, Max Planck Institute for the Physics of Complex Systems, South American Institute for Fundamental Research, Universidade Estadual Paulista (UNESP) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Superconductivity Coupling Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity FOS: Physical sciences Superconductivity (cond-mat.supr-con) chemistry.chemical_compound Condensed Matter - Strongly Correlated Electrons chemistry Pairing Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Electronic band structure Strontium ruthenate Parity bit |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Strontium ruthenate (Sr$_2$RuO$_4$) 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 $c_{66}$ at the superconducting transition temperature, the available experiments point towards an even-parity chiral superconductor with $k_z(k_x\pm ik_y)$-like $E_g$ symmetry, which has consistently been dismissed based on the quasi-two-dimensional electronic structure of Sr$_2$RuO$_4$. Here, we show how the orbital degree of freedom can encode the two-component nature of the $E_g$ 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 $E_g$ 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. 6+10 pages, 5 figures |
| Databáze: | OpenAIRE |
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