Abstract

CONTRERA, P.; OSORIO, D.  and  TSUCHIYA, S.. Quasi-point versus point nodes in Sr₂RuO₄, the case of a flat tight binding γ sheet. Rev. mex. fis. [online]. 2022, vol.68, n.6.  Epub July 31, 2023. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.68.060501.

We perform a numerical study of the unitary regime as a function of disorder concentration in the imaginary part of the elastic scattering cross-section for the compound Sr2RuO4 in the flat band non-disperse limit. By using a self-consistent tight binding (TB) method, we find a couple of families of Wigner probabilistic functions that help to explain macroscopically the distribution between Fermion dressed quasiparticles and Cooper pairs, and also the position of nodes in the order parameter for Sr2RuO4. Therefore, we are able to show that a TB model for the FS γ-sheet, numerically shows 4 point nodes in a flat γ sheet limit, or 4 quasi-point nodes for strong dispersion γ sheet limit in the reduced phase scattering space (RPS).

Keywords : Unconventional superconductivity; flat bands, triplet reversal time broken state; FS γ-sheet; Sr₂RuO₄; non-magnetic disorder; elastic scattering cross-section; tiny gap, point nodes, quasi-point nodes, wigner distribution probabilities, computational material design.

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