Kavli Affiliate: David A. Muller
| First 5 Authors: Antonio Gonzalez, Samuel J. Poage, Bernardo Langa, Jr., Deepak Sapkota, Salva Salmani-Rezaie
| Summary:
The intersection of superconductivity and ferroelectricity hosts a wide range
of exotic quantum phenomena. Here, we report on the observation of
superconductivity in high-quality tin telluride films grown by molecular beam
epitaxy. Unintentionally doped tin telluride undergoes a ferroelectric
transition at ~100 K. The critical temperature of superconductivity increases
monotonically with indium concentration. The critical field of
superconductivity, however, does not follow the same behavior as critical
temperature with indium concentration and exhibits a carrier-density-dependent
violation of the Pauli limit. The electron-phonon coupling, from the McMillan
formula, exhibits a systematic enhancement with indium concentration,
suggesting a potential violation of BCS weak coupling at high indium
concentrations.
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