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We theoretically predict proximity-induced odd-frequency (odd-$\omega$)pairing on the surface of a Weyl nodal loop semimetal, characterized by a nodalloop Fermi surface and drumhead-like surface states (DSSs), attached toconventional spin-singlet $s$-wave superconducting leads. Due to the completespin polarization of the DSS, odd-$\omega$ equal-spin triplet pairing ispresent, and we show that it gives rise to a finite Josephson current. Placingan additional ferromagnet in the junction can also generate odd-$\omega$mixed-spin triplet pairing, but the pairing and current is not affected if themagnetization is orthogonal to the DSS spin-polarization, which furtherconfirms the equal-spin structure of the pairing.

Signature of odd-frequency equal-spin triplet pairing in the Josephson current on the surface of Weyl nodal loop semimetals