Simultaneous widefield magnetic imaging and transport of superconductivity at high pressures

In recent years, Nitrogen-Vacancy centers in diamond have proven to be effective quantum sensors that can be integrated within diamond anvil cells (DACs) in order to perform local spectroscopy at high pressures. In conjunction with confocal microscopy, this approach has been used to probe magnetic signatures, i.e. the Meissner effect, of high-pressure hydride superconductors. Here, we extend these methods toward widefield imaging and demonstrate the ability to measure the spatially dependent magnetic field response of a superconducting material (BSCCO-2212) throughout the entirety of the DAC sample chamber with sub-micron precision in a single-shot image. Such local measurements can reveal features within the material that are otherwise imperceptible, and can be used to investigate properties such as the superconducting grain size and lattice dislocations. Combined with electrical transport, our work opens the door to simultaneously characterizing the magnetic and transport response of a broad class of quantum materials.