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Strontium titanate has resurfaced as a material prompting vigorous debateabout the origin of its superconductivity in the extremely low carrierconcentration regime. Here, we used simultaneous AC susceptibility andtransport methods to explore the superconducting phase transition region inthis material. We determined that strontium titanate is extremely sensitive toeven small AC fields, which also influence the resistive transition; we suggestthat extreme vortex sizes and mobilities contribute to this large effect. Ourfindings will be of importance for accurately determining transitiontemperature, informing the debate about the pairing mechanism in strontiumtitanate, for which even millikelvin errors may be critical.

Precision measurements of the AC field dependence of the superconducting transition in strontium titanate