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Superconducting Symmetries of Sr_{2}RuO_{4} from First-Principles Electronic Structure.

O Gingras1, R Nourafkan2, A-M S Tremblay2,3

  • 1Département de Physique and Regroupement Québécois sur les Matériaux de Pointe, Université de Montréal, C. P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada.

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Researchers explored the superconducting symmetry of Sr_{2}RuO_{4} by analyzing spin and charge fluctuations. They identified potential spin-singlet d-wave and time-reversal symmetry-breaking spin-triplet pairing mechanisms.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Correlated electronic-structure calculations accurately describe the normal state of strontium ruthenate (Sr_{2}RuO_{4}).
  • The superconducting symmetry of Sr_{2}RuO_{4} remains experimentally undetermined, posing a significant challenge in understanding its exotic electronic properties.

Purpose of the Study:

  • To construct spin and charge fluctuation pairing interactions for Sr_{2}RuO_{4} based on its correlated normal state.
  • To elucidate the possible superconducting pairing symmetries, including time-reversal symmetry-breaking states.

Main Methods:

  • Development of pairing interactions from correlated normal state properties.
  • Application of normal-state Eliashberg equations to determine superconducting instabilities.
  • Analysis of spin and charge fluctuations to identify pairing mechanisms.

Main Results:

  • Correlations were found to suppress ferromagnetic fluctuations while enhancing antiferromagnetic fluctuations and interorbital pairing.
  • Spin-singlet d-wave pairing was identified near magnetic instabilities.
  • Two time-reversal symmetry-breaking spin-triplet pairing states were discovered: an odd-frequency s-wave and a doubly degenerate interorbital pairing between d_{xy} and (d_{yz},d_{xz}) orbitals.

Conclusions:

  • The study provides crucial insights into the potential superconducting mechanisms in Sr_{2}RuO_{4}.
  • The findings suggest complex pairing symmetries beyond simple conventional superconductivity.
  • This work contributes to the ongoing quest for understanding unconventional superconductivity in correlated materials.