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Obstructions to odd-frequency superconductivity in Eliashberg theory
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We present a necessary condition for odd-frequency (odd-f) superconductivity (SC) to occur in a large class of materials described by Eliashberg theory. We use this condition to prove a no-go theorem ruling out the occurrence of odd-f SC in standard one-band superconductors with pairing interactions mediated by phonon exchange. We also present a corresponding no-go theorem for superconductors with interactions mediated by spin-fluctuations. Our results explain why odd-f SC is rare in conventional materials, and they open up the possibility for a search for materials with interactions designed so as to allow for odd-f SC.
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Superconductivity from phonon-mediated retardation in a single-flavor metal
Acoustic-phonon retardation alone can produce odd-parity p-wave superconductivity in a single-flavor metal where the static BCS approximation predicts no pairing.
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