Field-induced superconductivity is a rare phenomenon where an applied magnetic field enhances or induces superconductivity. This fascinating effect arises from a complex interplay between magnetism and superconductivity, and it offers the tantalizing technological possibility of an infinite magnetoresistance superconducting spin valve. Here, we demonstrate field-induced superconductivity at a record-high temperature of T=9K in two samples of the ferromagnetic superconductor Eu(Fe0.88Co0.12)2As2. We combine tunable uniaxial stress and applied magnetic field to shift the temperature range of the zero-resistance state between 4K and 10K. We use x-ray diffraction and spectroscopy measurements under stress and field to demonstrate that stress tuning of the nematic order and field tuning of the ferromagnetism act as independent tuning knobs of the superconductivity. Finally, DFT calculations and analysis of the Eu dipole field reveal the electromagnetic mechanism of the field-induced superconductivity.
@article{arxiv.2306.12492,
title = {Strain-Switchable Field-Induced Superconductivity},
author = {Joshua J. Sanchez and Gilberto Fabbris and Yongseong Choi and Jonathan M. DeStefano and Elliott Rosenberg and Yue Shi and Paul Malinowski and Yina Huang and Igor I. Mazin and Jong-Woo Kim and Jiun-Haw Chu and Philip Ryan},
journal= {arXiv preprint arXiv:2306.12492},
year = {2023}
}