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Spin susceptibility for orbital-singlet Cooper pair in the three-dimensional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> superconductor
We study the spin susceptibility of the orbital-singlet pairings, including the spin-triplet/orbital-singlet/$s$-wave ${E}_{g}$ representation proposed by Suh et al. [H. G. Suh et al., Phys. Rev. Research 2, 032023(R) (2020)], for a three-orbital model of superconducting ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ in three dimensions. For the pseudospin-singlet states represented in the band basis, the …