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

Abstract

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

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Cited by in corpus (5)

• Scanning SQUID characterization of extremely overdoped $L{a}_{2-x}S{r}_{x}Cu{O}_4$
• Giant Grüneisen parameter in a strain-tuned superconducting quantum paraelectric: A consequence of the vanishing ferroelectric phonon energy
• A local maximum in the superconducting transition temperature of Nb-doped strontium titanate under uniaxial compressive stress
• Millikelvin-compatible apparatus for studies of quantum materials under uniaxial stress
• Strain-engineered interaction of quantum polar and superconducting phases