Spin-nematic (quadrupolar) order turns the fermion-quadrupolar interaction into a four-fermion pairing interaction that yields p-wave superconductivity; the sign of the coupling fixes equal-spin versus opposite-spin pairing, and the critical coupling vanishes at zero chemical potential.
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Spin-nematic order induced superconductivity
Spin-nematic (quadrupolar) order turns the fermion-quadrupolar interaction into a four-fermion pairing interaction that yields p-wave superconductivity; the sign of the coupling fixes equal-spin versus opposite-spin pairing, and the critical coupling vanishes at zero chemical potential.