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Superconductors that possess both broken spatial inversion symmetry andspin-orbit interactions exhibit a mix of spin singlet and triplet pairing.Here, we report on measurements of the superconducting properties ofelectron-doped, strained SrTiO3 films. These films have an enhancedsuperconducting transition temperature and were previously shown to undergo atransition to a polar phase prior to becoming superconducting. We show thatsome films show signatures of an unusual superconducting state, such as anin-plane critical field that is higher than both the paramagnetic and orbitalpair breaking limits. Moreover, nonreciprocal transport, which reflects theratio of odd versus even pairing interactions, is observed. Together, thesecharacteristics indicate that these films provide a tunable platform forinvestigations of unconventional superconductivity.

Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films