Tunneling spectroscopy of a dilute oxide superconductor

Adrian Grant Swartz
Event Date and Time: 
Thu, 2017-04-20 11:00 - 12:30
Hennings 318
Local Contact: 
Leanne Ebbs / Andrea Damascelli
The nature of superconductivity in SrTiO3 has remained an open question for more than 50 years. The ongoing debate centers heavily on the role that high energy phonons play in pairing, the relevance of multi-band superconductivity, and the nature of superconductivity in the limit of low carrier density. Using a newly developed method for engineering band alignments at epitaxial oxide interfaces, we have explored this problem in Nb-doped SrTiO3 with high-resolution tunneling spectroscopy. The data indicate strong coupling to the highest energy longitudinal optical phonon mode consistent with a polaronic regime. Surprisingly, when cooled below the superconducting transition temperature Tc, we observe a single superconducting gap corresponding with the weak-coupling limit of BCS theory. I will discuss possible pairing scenarios and the relevance to emerging 2D superconductors such as LaAlO3/SrTiO3 and monolayers of FeSe.
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