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Superconducting strontium titanate (STO) is in the spotlight as a low carrierconcentration semiconductor in proximity to polar order. Its superconductingpairing mechanism poses an open fundamental challenge, which may be resolved bycontrolling how strongly the superconducting and polar orders interact. Here,we show for the first time that non-monotonic superconducting transitiontemperature behavior in uniaxially compressed STO can occur, revealing areduction followed by a peak in the superconducting transition temperature. Thecorresponding displacements in the lattice are extremely small, in the subpicometer range, indicating that this material approaches a singularity inelectron-phonon coupling, consistent with STO transforming to the polar(ferroelectric) phase that influences the superconductivity.

A local maximum in the superconducting transition temperature of Nb-doped strontium titanate under uniaxial compressive stress